LE515 Bluetooth 5.4 Transmitter and Receiver User Manual

1. Product Overview

The LE515 is a versatile 3-in-1 wireless audio adapter, functioning as a Bluetooth transmitter, receiver, and broadcast device. It features Bluetooth 5.4 technology, LC3 broadcast mode, and a portable design with long battery life.

Device Components

Image: Detailed diagram of the LE515 Bluetooth adapter highlighting its various ports and buttons.

• 3.5mm audio plug: For audio input/output.
• Audio status light: Indicates current audio input status.
• TX status light: Indicates Transmitter mode status.
• RX status light: Indicates Receiver mode status.
• TX button: Used for Transmitter mode operations.
• Power/Multi function key: For power on/off and multi-functional operations.
• RX button: Used for Receiver mode operations.
• Charging light: Indicates charging status.
• USB/charging interface: Type-C port for charging and USB audio input/output.

2. Key Functions and LED Indications

Key Operations

The device features intuitive button controls. (x2 = double-click, 1S = long press for 1 second, 2S = long press for 2 seconds)

Image: Table illustrating button presses and their corresponding functions.

LED Status Indications

Image: Table detailing the meaning of different LED light behaviors.

3. Functional Operation

3.1 Turn On/Off

Press and hold the Power/Multi function key for 2 seconds to turn the device on or off.

3.2 Automatic Shutdown Function

The device automatically shuts down after 15 minutes of no connection. To reactivate, it needs to be restarted manually. Note: This automatic shutdown feature does not apply when the device is in TX broadcast mode.

3.3 Low Battery Alarm Prompt

When the device's battery is low, the charging red light will flash.

3.4 TX/RX Mode Switching

To switch between Transmitter (TX) and Receiver (RX) modes:

• Double-click the TX button to enter TX mode. The TX indicator light will turn on.
• Double-click the RX button to enter RX mode. The RX indicator light will turn on.

Note: The switching interval time between modes should not be less than 3 seconds.

3.5 Bluetooth/Broadcast Mode Switching

Within TX or RX mode, you can switch between Bluetooth and Broadcast sub-modes:

• In TX mode: Double-click the TX button to switch between Bluetooth (TX green light on) and Broadcast (TX blue light on) working modes.
• In RX mode: Double-click the RX button to switch between Bluetooth (RX green light on) and Broadcast (RX blue light on) working modes.

Note: The switching interval time between sub-modes should not be less than 3 seconds.

3.6 Audio Source Input Switching (TX Mode Only)

In TX mode, double-click the Power/Multi function key to cycle through available audio input sources.

• In TX Bluetooth mode: You can switch between AUX and USB (when connected to a PC).
• In TX Broadcast mode: You can switch between Bluetooth (from a phone), AUX, and USB (when connected to a PC).

4. TX Transmission Mode

4.1 TX Transmission - Bluetooth Mode

This mode allows the device to wirelessly transmit audio from a source (e.g., TV) to Bluetooth earphones or speakers.

Image: Setup diagram for TX Bluetooth mode, connecting a TV to Bluetooth headphones.

Operation Steps:

1. Ensure your Bluetooth speaker or headset is turned on and in pairing mode.
2. Press and hold the device's Power/Multi function key for 2 seconds to turn it on. The power on LED light will illuminate.
3. Double-click the TX button to switch the device to "TX" mode. The TX light will turn on.
4. Insert the 3.5mm audio plug of the device into the audio output interface of your TV or other audio source.
5. The device will automatically enter the search pairing state (the "TX" green light will flash rapidly).
6. After a successful connection, the "TX" green light on the device will flash slowly, and audio will be heard from your Bluetooth speaker or headphones.

Notes for TX Bluetooth Mode:

• You can double-click the Power/Multi function key to switch audio input sources: the audio blue light indicates AUX audio input, and the audio green light indicates USB audio input (when connected to a PC).
• Different Bluetooth devices may have varying search and connection times. If connection is not successful for a prolonged period, restart the device and try again.
• A rapidly flashing "TX" green light indicates the device is searching for Bluetooth devices.

4.2 TX Transmission - Broadcast Mode

This mode allows the device to wirelessly send audio from a source to multiple RX broadcast receivers simultaneously.

Image: Setup diagram for TX Broadcast mode, connecting a TV to multiple audio receivers.

Operation Steps:

1. Press and hold the device's Power/Multi function key for 2 seconds to turn it on. The power on LED light will illuminate.
2. Double-click the TX button to switch the device to "TX" mode. The TX light will turn on.
3. Double-click the TX button again to switch the device to TX broadcast mode. The "TX" blue light will turn on.
4. Insert the 3.5mm audio plug of the device into the audio output interface of your audio source device.
5. Turn on the broadcast receiver(s) (devices with the RX broadcast function of this device) and place them in broadcast receiving function. (Refer to Section 5.2 for RX broadcast mode operation instructions).
6. In broadcast mode, the device automatically connects. After successful connection, the "RX" blue light on the broadcast receiver(s) will remain on.

Notes for TX Broadcast Mode:

• You can double-click the Power/Multi function key to switch audio input sources: the audio blue light indicates AUX audio input, the audio white light indicates Bluetooth audio input (where a phone can connect to the LE515max and forward its Bluetooth music), and the audio green light indicates USB audio input (when connected to a PC).
• The blue light "TX" on the device indicates TX broadcast working mode.
• The "RX" blue light on the broadcast receiver (if it's another LE515 in RX broadcast mode) being constantly on indicates a successful broadcast connection.

5. RX Receiver Mode

5.1 RX Receiver - Bluetooth Mode

This mode allows the device to receive music from mobile phones, computers, or tablets via Bluetooth and transfer it to audio devices with AUX audio input interfaces (e.g., car stereo, home speakers).

Image: Setup diagram for RX Bluetooth mode, connecting a phone to a speaker via the LE515.

Operation Steps:

1. Press and hold the device's Power/Multi function key for 2 seconds to turn it on. The power on LED light will illuminate.
2. Double-click the RX button to switch the device to "RX" mode. The RX light will turn on.
3. Double-click the RX button again to switch the device to RX Bluetooth working mode. The "RX" green light will turn on, and the device will automatically enter pairing mode (the "RX" green light will flash rapidly).
4. Insert the 3.5mm audio plug into the audio input interface of your home audio equipment (e.g., speaker, car stereo).
5. On your phone or other source device, turn on Bluetooth, search for "LE515max", and connect to it.
6. After successful connection, the "RX" green light on the device will flash slowly, and you can now enjoy music.

5.2 RX Receiver - Broadcast Mode

This mode allows the device to receive sound from a broadcast transmitter (another LE515 in TX broadcast function) onto audio equipment with an AUX audio input interface.

Image: Setup diagram for RX Broadcast mode, receiving audio from a TV via the LE515.

Operation Steps:

1. Press and hold the device's Power/Multi function key for 2 seconds to turn it on. The power on LED light will illuminate.
2. Double-click the RX button to switch the device to "RX" mode. The RX light will turn on.
3. Double-click the RX button again to switch the device to RX broadcast mode. The "RX" blue light will turn on, and the device will automatically enter pairing mode (the "RX" blue light will flash rapidly).
4. Insert the 3.5mm audio plug into the audio input interface of your home audio equipment.
5. Ensure the broadcast transmitter (another LE515 in TX broadcast mode) is turned on and connected to its audio source (Refer to Section 4.2 for TX broadcast mode operation instructions).
6. The device automatically connects. After successful connection, the "RX" blue light on this device will stay on.

6. Charging

The device's charging red light will flash during product use when the battery is low, indicating the need for charging.

1. Insert the Type-C charging cable into the product's charging port.
2. Connect the other end of the cable to a USB 5V power output port (e.g., a phone charger or a computer's USB interface).
3. The charging time is approximately 2 hours. The red light will stay on during charging and will turn off once charging is complete.

Note:

• If the battery level is extremely low or the quality of the charging power source is poor, it may cause the device to produce current noise during operation.

7. Main Parameters (Specifications)

8. Packaging List

The product package includes the following items:

• Multi-functional transceiver (LE515) x1
• Product manual x1 (A digital version of this manual is available as a PDF: View PDF Manual)
• Type-C charging cable x1

9. Troubleshooting

If you encounter issues with your LE515 device, please refer to the following common troubleshooting steps:

• Device not turning on: Ensure the device is charged. Press and hold the Power/Multi function key for at least 2 seconds.
• No audio output/input:
  • Check if the 3.5mm audio cable is securely connected to both the LE515 and the audio source/receiver.
  • Verify that the correct audio input source is selected (double-click Power/Multi function key in TX mode).
  • Ensure the volume on both the LE515 (long press TX/RX buttons) and the connected audio device is adjusted appropriately.
• Bluetooth pairing issues:
  • Ensure the LE515 is in the correct TX Bluetooth or RX Bluetooth mode (TX green light flashing rapidly for TX, RX green light flashing rapidly for RX).
  • Place the LE515 and the target Bluetooth device close to each other.
  • Turn off and on Bluetooth on your source device (phone, headphones).
  • Restart the LE515 device.
  • Clear previous Bluetooth connections on your source device if possible.
• Broadcast mode connection issues:
  • Ensure both the transmitting and receiving LE515 devices are in their respective broadcast modes (TX blue light on for transmitter, RX blue light flashing rapidly for receiver).
  • Verify that the audio source is correctly connected to the transmitting LE515.
  • Ensure the receiving LE515 is within the unobstructed transmission range (>45M).
• Current noise during charging: This can occur if the battery is very low or the charging power source is unstable. Try using a different, high-quality 5V USB charger.
• Device automatically shuts down unexpectedly: If not in TX broadcast mode, the device will shut down after 15 minutes of no connection. This is normal behavior.

10. User Tips

Based on general user experiences with similar devices, here are some tips for optimal use:

• Keep devices close during pairing: For the initial Bluetooth connection, keep the LE515 and your target device (headphones, phone, etc.) within a few feet of each other to ensure a stable pairing process.
• Charge fully before first use: To maximize battery life and ensure stable operation, fully charge the device before its initial use.
• Use a reliable power adapter: When charging, use a standard 5V USB power adapter to avoid potential current noise or charging issues.
• Understand LED indicators: Familiarize yourself with the LED status lights (green, blue, red, flashing patterns) as they provide crucial information about the device's current mode and status.
• Experiment with audio sources: The ability to switch between AUX, USB, and Bluetooth inputs in TX mode offers great flexibility. Try different sources to find what works best for your setup.

11. Warranty and Support

For warranty information and technical support, please refer to the seller's policies on the platform where the product was purchased. Keep your proof of purchase for any warranty claims.