Sennheiser HD 4.50BTNC / HD 4.50R Wireless Headphones

The HD 4.50BTNC/HD 4.50R Wireless Headphones

The HD 4.50BTNC/HD 4.50R Wireless headphones offer great sound quality for everyday listening on the move. These headphones are the perfect companion for your mobile devices, providing you with unrivalled listening pleasure and easy communication with their NoiseGard™ Active Noise Cancellation feature, long-lasting battery life, and robust, foldable design.

Features

• Closed circumaural design featuring Bluetooth® wireless technology
• Robust, foldable headband for easy storage on the go
• NoiseGard™ Active Noise Cancellation for optimum isolation from background noise and outstanding audio performance
• Immediate pairing to smart devices using NFC
• Up to 25 hours battery life
• Comes with an attachable audio cable for use in environments where Bluetooth® connectivity is not permitted

Bluetooth

The headphones comply with the Bluetooth 4.0 standard and are compatible with all Bluetooth 1.1, 1.2, 2.0, 2.1, 3.0, and 4.0 devices with the following Bluetooth profiles: HFP (Hands-Free Profile), HSP (Headset Profile), AVRCP (Audio Video Remote Control Profile), and A2DP (Advanced Audio Distribution Profile). The headphones provide wireless freedom to give hands-free convenience during phone calls or when listening to music.

NFC

Near Field Communication (NFC) is a short-range wireless technology that enables connection and communication between NFC-capable electronic devices by placing them near one another or with a single touch.

NoiseGard™

The NoiseGard™ active noise compensation system is based on the principle of cancelling out sound using "anti-sound". Tiny microphones pick up low-frequency ambient noise near the ear. The NoiseGard electronics use this noise to generate a sound wave which is the exact opposite, the effect being that the polarity reversed signal cancels most of the outside noise.

With aptX® audio coding, you can be assured of crisp, pure, and full stereo sound. It allows you to not only hear, but experience and feel the audio as it was intended. Utilizing aptX®, Bluetooth technology can now offer wireless audio quality that is indistinguishable from the highest quality wired connection.

Package Includes

• Headphones
• Carry case
• Audio cable with 2.5 mm and 3.5 mm jack plug
• USB charging cable with micro-USB connector
• Quick guide
• Safety guide

A list of accessories can be found at www.sennheiser.com. For information on suppliers, contact your local Sennheiser partner: www.sennheiser.com > "Sales Partner".

Product Overview

Overview of the Headphones

1 Headband
2 Ear pads
3 Ear cups
4 NFC panel
5 LED
6 Power button
7 Multifunction button
8 Volume +/- buttons
9 Audio input
10 Micro-USB input

Overview of Pictograms

Pictograms for pressing a button:

• [Press and release] : Press and immediately release the button
• [Press twice] : Press the button twice
• [Press and hold] : Press the button and hold for 5 seconds

Pictograms for the LED:

• [LED on] : The LED lights up
• [LED flashing] : The intervals signify flashing
• [LED continuous] : The LED lights up/flashes continuously
• [LED interval] : The time the LED lights up before blinking

Examples of pictograms that may be used in this manual:

• [LED flashes continuously] : The LED flashes continuously
• [LED on 3s, then off] : The LED lights up for 3 seconds, then off, and repeats
• [LED on, then off 2s] : The LED lights up, then off for 2 seconds, and repeats
• [LED continuous] : The LED lights up continuously
• [LED flashes blue/red per second] : The LED continuously flashes blue and red per second

Notes marked with the pictogram "i" provide useful information on the use of the headphones.

Overview of LED Indications

LED Indications During Operation

• [LED solid blue] : The headphones switch on
• [LED flashes blue 3 times] : Pairing/connecting with a device is successful
• [LED solid red] : The headphones switch off
• [LED flashes red 3 times] : The headphones are disconnected from the device
• [LED flashes red slowly] : The headphones are outside the Bluetooth range of the device
• [LED flashes red/blue alternately] : Pairing with a device is unsuccessful
• [LED flashes blue and red alternately] : The headphones are in pairing mode
• [LED flashes purple 3 times] : The device is/devices are successfully cleared from the headphones
• [LED flashes purple] : NoiseGard is activated/deactivated (Bluetooth connection)
• [LED solid blue] : The headphones are in idle mode (headphones are paired but not connected to the device)
• [LED solid blue] : NoiseGard is activated (audio cable connection with sufficient battery life)

LED Indications During Calls

• [LED flashes blue] : Incoming call
• [LED flashes red] : Incoming call with an almost empty battery

Overview of Buttons

Power Button

• [Press and release] : Switches the headphones on and off
• [Press and hold 2s] : Activates/deactivates NoiseGard (audio cable connection with sufficient battery life)

Multifunction Button

• [Press once] : Accepts/ends a call
• [Press once, then hold] : Accepts an incoming call and holds the active call
• [Press once] : Plays/pauses a track
• [Press twice] : Redials the last number called
• [Press and hold] : Holds/unholds a call
• [Press once] : Accepts an incoming call and ends the active call
• [Press twice] : Toggles between 2 active calls
• [Press and hold 2s] : Rejects a call
• [Press and hold 2s] : Activates the voice control
• [Press and hold 2s] : Transfers a call between the smartphone and the headphones
• [Push multifunction button up] : Plays the next track
• [Push multifunction button down] : Plays the previous track
• [Push and hold multifunction button up] : Rewinds a track
• [Push and hold multifunction button down] : Fast-forwards a track

Volume +/- Buttons

• [Press Volume +] : Increases the volume
• [Press Volume -] : Decreases the volume

Getting Started

Charging Basics

A complete charging cycle takes about 2 hours. Before using the headphones for the first time, charge the headphones for a complete charging cycle without interruption.

When the battery is almost empty or when the headphones are being charged, the LED lights up or flashes as indicated in the following table and a voice prompt announces the charge condition of the battery. When the battery charge drops to a low level, a voice prompt asks you to recharge the headphones.

It is recommended to charge the headphones using only the supplied USB cable. If you charge the headphones using an external USB power adapter, it is recommended to use an adapter with an output rating of 500 mA or higher.

Charging the Headphones

1. Connect the micro-USB plug of the charging cable to the micro-USB input of the headphones.
2. Connect the USB plug to the USB port of your computer. If you are using an external power adapter, connect the USB plug to the power adapter or to the USB car charger adapter, and connect to the power source. The LED flashes/lights up depending on the battery life of the headphones. The headphones utilize an intelligent battery charging technology that prevents overcharging.

Battery life indicator on your device: The battery life of your headphones may also be displayed on the screen of your smartphone or device.

Pairing the Headphones

CAUTION

Danger of malfunction! The transmitted radio waves of mobile phones can impair the operation of sensitive and unprotected devices.

• Only make calls with the headphones in locations where Bluetooth is permitted.

The HD 4.50BTNC/HD 4.50R Wireless headphones comply with the Bluetooth 4.0 standard. In order that data can be transmitted wirelessly using Bluetooth, you have to pair your headphones with a compatible Bluetooth device that supports the following profiles: HFP (Hands-Free Profile), HSP (Headset Profile), AVRCP (Audio Video Remote Control Profile), and A2DP (Advanced Audio Distribution Profile).

When you switch the headphones on for the first time, they automatically go to pairing mode. If the headphones have already been paired with a few devices, they automatically try to connect to the most-recently connected Bluetooth device when switched on. The headphones can save the connection profiles of up to eight Bluetooth devices or smartphones.

You can instantly pair the headphones with your device if the device supports NFC.

Pairing the Headphones with a Bluetooth Device Using NFC

The following sections describe, using a smartphone as an example, how to pair your HD 4.50BTNC/HD 4.50R Wireless headphones with a Bluetooth device using NFC. If the instructions provided do not work on your device, proceed as described in the instruction manual of the device.

You can pair the headphones with other devices using NFC regardless of the headphones' power state (on or off).

1. Activate NFC on your smartphone.
2. Scan the smartphone to the NFC panel on the left ear cup of the headphones. You hear the voice prompt "power on" and a beep sound. The LED flashes blue and red.
3. Click "Yes" if the pairing confirmation dialog appears on the screen of your smartphone (this step may vary depending on your smartphone). If pairing was successful, you hear the voice prompt "connected". The LED flashes blue 3 times.

Pairing the Headphones with a Bluetooth Device

Ensure that the headphones are within the 20 cm range of your smartphone when performing this procedure.

1. Switch the headphones on (see page 19).
   • If you pair the headphones to the device for the first time, they automatically go to pairing mode.
   • If the headphones don't automatically go to pairing mode, switch the headphones off and press the power button again for 4 seconds or until you hear the voice prompt "power on" and a beep sound. The LED flashes blue and red. The headphones are in pairing mode.
2. Activate Bluetooth on your smartphone.
3. On your smartphone, start a search for Bluetooth devices. All active Bluetooth devices in the proximity of your smartphone are displayed.
4. From the list of found Bluetooth devices, select "HD 4.50BTNC"/"HD 4.50R". If necessary, enter the default PIN code "0000". If pairing was successful, you hear the voice prompt "connected". The LED flashes blue 3 times.

Disconnecting the Headphones from Your Bluetooth Device

• Deactivate Bluetooth on your smartphone. The headphones are disconnected from the smartphone. The headphones then search for other paired devices. If no device is found, you hear the voice prompt "lost connection". The headphones go to idle mode.

Adjusting the Headband

For good sound quality and best possible wearing comfort, you can adjust the ear pad location on the headband to properly match the size of your head.

• Wear the headphones so that the headband runs over the top of your head.
• Adjust the location of the ear pads by moving the ear cups up and down the headband slider until:
  • your ears are comfortably covered by the ear pads,
  • you feel even, gentle pressure around your ears,
  • a snug fit of the headband on the head is ensured.

Using the Headphones

Switching the Headphones On

WARNING: Danger due to high volume levels! Listening at high volume levels for long periods of time can lead to permanent hearing defects.

• Before putting the headphones on, set the volume to a low level.
• Do not continuously expose yourself to high volume levels.
• Press the power button for 2 seconds. You hear the voice prompts "power on" and "connected" and the LED flashes blue 3 times.

Switching the Headphones Off

• Press the power button for 2 seconds. You hear the voice prompt "power off" and the LED flashes red 3 times.

Adjusting the Volume

WARNING: Danger due to high volume levels! Switching between audio sources may cause enormous volume jumps that can permanently damage your hearing.

• Before putting the headphones on and before switching between audio sources, adjust the volume to a low level.
• Do not continuously expose yourself to high volume levels.

You can adjust the volume for music and calls.

• Press the Volume +/- buttons once to increase or decrease the volume. You hear a beep sound. When the maximum volume is reached, you hear an alert.

Using NoiseGard™

The HD 4.50BTNC/HD 4.50R Wireless headphones provide excellent attenuation of ambient noise using the NoiseGard Active Noise Cancellation technology.

You can activate or deactivate NoiseGard if your headphones are connected to the smartphone using Bluetooth or the audio cable.

Activating/Deactivating NoiseGard When Connected via Bluetooth

• Simultaneously press and hold the Volume + /- buttons. The LED flashes purple 3 times. NoiseGard toggles between on and off.

Activating/Deactivating NoiseGard When the Audio Cable is Used

• Press the power button. NoiseGard toggles between on and off. The LED lights up blue to indicate that NoiseGard is active.

Playing Music

If your audio source supports the aptX® audio codec, the HD 4.50BTNC/HD 4.50R Wireless automatically plays music wirelessly in stunning aptX® audio quality. If your audio source does not support aptX®, the HD 4.50BTNC/HD 4.50R Wireless plays music in normal audio quality.

Pair/connect your headphones with the smartphone, see page 14. Play music on your smartphone. The music plays through the HD 4.50BTNC/HD 4.50R Wireless headphones.

Controlling Music Playback

The following music functions are only available when the headphones and your device are connected via Bluetooth. Some smartphones, music apps, or players may not support all functions.

Playing/Pausing Track

• [Press multifunction button once] : Plays/pauses a track

Playing the Next/Previous Track

• [Push multifunction button up] : Plays the next track
• [Push multifunction button down] : Plays the previous track

Fast-Forwarding or Rewinding a Track

• [Push and hold multifunction button up] : Rewinds a track
• [Push and hold multifunction button down] : Fast-forwards a track

Making Calls on the Headphones

The following call functions are only available if the headphones and smartphone are connected via Bluetooth. Some smartphones may not support all functions.

Making a Call

Dial the desired number on your smartphone. If your smartphone does not automatically transfer the call to the headphones, select the HD 4.50BTNC/HD 4.50R Wireless as the audio source on your smartphone (see the instruction manual of your smartphone if necessary).

Accepting/Rejecting/Ending a Call

If your headphones are connected to a smartphone and you receive a call, you hear a ring tone in the headphones and the LED flashes blue. If the battery life of the headphones is low, the LED flashes red. If you are playing music when you receive a call, the music pauses until you end the call.

Press or push the multifunction button accordingly:

Transferring a Call to/from the Headphones

When a call has been established, you can transfer the call between the headphones and the smartphone.

• [Press multifunction button and hold for 2 seconds] : Transfers a call from the headphones to the smartphone
• [Press multifunction button and hold for 2 seconds] : Transfers a call from the smartphone to the headphones

Redialing

The redialing function must be supported by your smartphone or Bluetooth device (with HFP profile). This function may be required to be activated on your smartphone.

You can use this function when the headphones are not actively playing music or are used for making calls.

• [Press multifunction button twice] : Redials the last number called "redialing"
• [Press multifunction button once] : Cancels redialing "call ended"

Voice Control Function

The voice control function is only supported by Bluetooth smartphones with HFP profile.

You can use this function when the headphones are not actively playing music or are used for making calls.

1. Press the multifunction button and hold for 2 seconds.
   • [Press and hold multifunction button 2s] : Activates voice dialing "voice dialing"
2. Say your voice command, such as "Call Jane". The Bluetooth smartphone calls Jane.

Using the Audio Cable

Use the audio cable to listen to music when the headphones are running out of battery or when Bluetooth transmission is restricted or not allowed. The headphones immediately switch off once the audio cable is plugged into the audio input. If the battery of the headphones is sufficient, you can switch NoiseGard on to benefit from the noise cancelling feature of the headphones. To activate or deactivate NoiseGard when the audio cable is connected, see page 21.

Inserting the Audio Cable

1. Insert the 2.5 mm jack plug into the audio input of the headphones. Bluetooth is deactivated.
2. Connect the 3.5 mm jack plug to the audio output of your smartphone.

Care and Maintenance

CAUTION

Liquids can damage the electronics of the product! Liquids entering the housing of the product can cause a short-circuit and damage the electronics.

• Keep all liquids away from this product.
• Do not use any solvents or cleaning agents.

Replacing the Ear Pads

For reasons of hygiene, you should replace the ear pads from time to time. Spare ear pads are available from your local Sennheiser partner.

1. Lightly pull the ear pad away from ear cup until it is detached.
2. Secure the new ear pad by inserting the fixation band in the space on the ear cup. Ensure that the stitched line on the ear pad is positioned at the bottom.

Storage and Handling

To keep the headphones in good condition and to avoid nicks and scratches, fold the ear cups inwards towards the headband and store the headphones in the carry case when not in use or when carrying them around.

Replacing/Removing the Rechargeable Battery

CAUTION

Danger of damage to the product! During the warranty period, the rechargeable battery must only be replaced by an authorized Sennheiser service center, otherwise the warranty will be null and void.

• Contact your Sennheiser service center if the rechargeable battery needs to be replaced or removed. To find a Sennheiser service partner in your country, visit www.sennheiser.com.

Outside the warranty period, the rechargeable batteries may be replaced or removed by any qualified service center in an appropriate manner. Instructions on how to replace or remove the batteries for qualified service centers are available from the Sennheiser service partner.

Troubleshooting

If you encounter a problem that is not listed in the table, or if the solutions provided do not work, please contact an authorized Sennheiser service partner for assistance. To find a Sennheiser service partner in your country, visit www.sennheiser.com.

Leaving the Bluetooth Transmission Range

Wireless calling and streaming are only possible in the Bluetooth transmission range of your smartphone. The transmission range largely depends on environmental conditions such as wall thickness, wall composition, etc. With a free line of sight, the transmission range of most smartphones and Bluetooth devices is up to 10 meters.

If the headphones leave the Bluetooth transmission range of the smartphone, the sound quality deteriorates and you hear the voice prompt "lost connection". At this point, the connection breaks down completely. You can re-establish the connection if you re-enter the Bluetooth transmission range and you hear the voice prompt "connected".

• To re-establish the connection, press the multifunction button.

Clearing Previously Paired Devices

• Set the headphones to pairing mode, see page 16. The LED flashes blue and red. The headphones are in pairing mode.
• Simultaneously press the multifunction button and the power button for 4 seconds. The LED flashes purple 3 times. The headphones are permanently disconnected from all devices and immediately go into pairing mode.

Specifications

• Ear coupling: closed, circumaural
• Frequency response: 18-22,000 Hz
• Transducer principle: dynamic
• Sensitivity (microphone): 100-10,000 Hz
• Sound pressure level (SPL): 113 dB (1 kHz / 1 Vrms)
• THD (1 kHz, 100 dB): <0.5%
• Pick-up pattern: dual omni-directional microphones
• Noise compensation: NoiseGard™ active noise cancellation
• Input power: 3.7 VDC, 600 mAh: built-in rechargeable Lithium-Polymer battery; 5 VDC, 400 mA: USB charging
• Operating time: 19 hours (Bluetooth and NoiseGard on); 25 hours (Bluetooth only)
• Charging time: approx. 2 hours
• Weight: approx. 238 g
• Battery: Lithium Polymer
• Connectivity: Bluetooth version 4.0/NFC pairing
• Audio cable (optional/detachable): 1.4 m audio cable, 3.5 mm angled plug, gold-plated
• Connector: USB charging cable
• Maximum value of the static magnetic field at the surface: 2.4 mT

Trademarks

Sennheiser and NoiseGard™ are trademarks of Sennheiser electronic GmbH & Co. KG. The Bluetooth® word mark and logos are registered trademarks owned by Bluetooth SIG, Inc. and any use of such marks by Sennheiser electronic GmbH & Co. KG is under license. The N-Mark is a trademark or registered trademark of NFC Forum, Inc. in the United States and in other countries. The aptX mark and the aptX logo are trademarks of CSR plc or one of its group companies and may be registered in one or more jurisdictions. Other product and company names mentioned in this instruction manual/safety guide may be the trademarks or registered trademarks of their respective holders.

Sennheiser Communications A/S

Industriparken 27, DK-2750 Ballerup, Denmark

www.sennheiser.com

Publ. 07/19, A02