LENCENT T75 Bluetooth 5.0 FM Transmitter Car Adapter User Manual

1. Introduction

This manual provides detailed instructions for the LENCENT T75 Bluetooth 5.0 FM Transmitter Car Adapter. This device allows you to stream audio from your Bluetooth-enabled devices to your car's FM radio, make hands-free calls, and charge your mobile devices. Please read this manual thoroughly before use to ensure proper operation and to maximize your experience.

2. Product Overview

The LENCENT T75 is designed to enhance your in-car audio and connectivity. Key features include Bluetooth 5.0 for stable connections, dual microphones with CVC 8.0 noise cancellation for clear calls, a QC3.0 fast charging port, and multiple audio playback options.

2.1 Package Contents

• LENCENT T75 Bluetooth FM Transmitter
• AUX Cable
• User Manual

2.2 Device Layout

Figure 1: Front view of the LENCENT T75 Bluetooth FM Transmitter, showing the digital display, two USB charging ports (one QC3.0, one standard), an AUX port, and various control buttons including call answer/end, channel selection, and bass boost.

• FM Display: Shows the current FM frequency and other status indicators.
• QC3.0 USB Port: For fast charging compatible devices (up to 18W).
• Standard USB Port: For charging devices (5V/1A) and USB stick music playback.
• AUX Port: Audio output to connect to your car's AUX input for enhanced sound quality.
• Multi-function Button (Rotary Knob): Controls volume, track navigation, and call management.
• Bass Boost Button (b): Activates or deactivates deep bass enhancement.
• Channel (CH) Button: Used to set the FM frequency.
• Light Button: Cycles through LED light colors or turns them off.
• Dual Microphones: Integrated for hands-free calling.

3. Setup Instructions

3.1 Initial Installation

1. Insert the LENCENT T75 into your car's 12V/24V cigarette lighter socket. The device will power on automatically, and the LED display will illuminate.
2. The display will show the current car battery voltage for a few seconds, then switch to the FM frequency.

Figure 2: The LENCENT T75 displaying the car battery voltage upon initial power-up.

3.2 Setting the FM Frequency

1. Press the CH button. The FM frequency on the display will start flashing.
2. Rotate the multi-function knob left or right to select an unused FM frequency in your area. Choose a frequency with no strong radio station interference for optimal sound quality.
3. Once selected, wait a few seconds for the frequency to stop flashing, or press the CH button again to confirm.
4. Tune your car's FM radio to the exact same frequency as set on the LENCENT T75.

3.3 Bluetooth Pairing

1. After setting the FM frequency, the device will automatically enter Bluetooth pairing mode. The Bluetooth icon on the display will flash.
2. On your mobile device, enable Bluetooth and search for available devices.
3. Select "T75" from the list of found devices to connect.
4. Once successfully paired, the Bluetooth icon on the T75 display will stop flashing and remain solid. You will hear a confirmation tone.

4. Operating Instructions

4.1 Music Playback

The LENCENT T75 supports music playback via Bluetooth, USB stick, and AUX cable.

4.1.1 Bluetooth Streaming

• Ensure your mobile device is paired with the T75 via Bluetooth.
• Start playing music on your mobile device. The audio will be transmitted to your car's stereo via the selected FM frequency.
• Rotate the multi-function knob to adjust the volume.
• Press the multi-function knob left or right to skip to the previous or next track.

4.1.2 USB Stick Playback

• Insert a USB stick (up to 32GB) containing MP3, WMA, or WAV audio files into the standard USB port (5V/1A).
• The device will automatically detect the USB stick and begin playing music.
• Use the multi-function knob to control volume and track navigation.

Figure 3: The LENCENT T75 playing music directly from a USB stick.

4.1.3 AUX Mode

• Connect one end of the included AUX cable to the AUX port on the LENCENT T75.
• Connect the other end of the AUX cable to your car's AUX input port.
• This connection bypasses FM transmission and provides a direct audio output from the transmitter to your car's stereo, offering CD-like sound quality.

4.1.4 Bass Boost Function

• Press the b button on the device to activate the deep bass enhancement.
• Press the b button again to deactivate the bass boost.

Figure 4: Activating the bass boost feature for a more immersive audio experience.

4.2 Hands-Free Calling

The LENCENT T75 features dual microphones and CVC 8.0 noise cancellation for clear hands-free calls.

Figure 5: The dual microphone system with CVC 8.0 noise cancellation for improved call clarity.

• Answer Call: Press the multi-function knob once to answer an incoming call.
• End Call: Press the multi-function knob once during a call to hang up.
• Reject Call: Press and hold the multi-function knob for 2 seconds to reject an incoming call.
• Redial: Double-press the multi-function knob to redial the last number called.

Figure 6: Hands-free calling functionality with the LENCENT T75.

4.3 Voice Assistant

Activate your smartphone's voice assistant for safer driving.

• Press and hold the multi-function knob for 2 seconds (when not on a call) to activate Siri or Google Assistant on your paired mobile device.
• You can then use voice commands for navigation, sending messages, or making calls while keeping your hands on the wheel.

Figure 7: Using voice assistants like Siri or Google Assistant for hands-free control.

4.4 Charging Devices

The LENCENT T75 is equipped with two USB charging ports.

• QC3.0 Port: The orange USB port provides Quick Charge 3.0, delivering up to 18W (5V/3A) for compatible devices.
• Standard USB Port: The blue USB port provides 5V/1A charging and also supports USB stick music playback.

Figure 8: Fast charging a smartphone using the QC3.0 port on the LENCENT T75.

4.5 LED Lighting

The device features customizable LED ambient lighting.

• Press the Light button to cycle through 9 different color options: Red, Blue, Green, Yellow, Purple, Cyan, White, Rainbow, and Rainbow Stream.
• Continue pressing the Light button to turn the lights off.

Figure 9: The LENCENT T75 displaying its multi-color LED lighting options.

5. Maintenance

• Keep the device dry. Moisture can damage the internal circuitry.
• Do not expose the device to extreme temperatures.
• Clean the device with a soft, dry cloth. Avoid using harsh chemicals or abrasive cleaners.
• Store the device in a cool, dry place when not in use for extended periods.

6. Troubleshooting

• No Power: Ensure the device is securely plugged into the car's cigarette lighter socket. Check if the car's cigarette lighter fuse is intact.
• Static or Poor Sound Quality:
  • Ensure your car's FM radio is tuned to the exact same frequency as the T75.
  • Try changing the FM frequency on the T75 to an unused channel with less interference.
  • Adjust the volume on both the T75 and your car stereo.
  • If using AUX mode, ensure the AUX cable is securely connected to both the T75 and your car's AUX input.
• Bluetooth Connection Issues:
  • Ensure Bluetooth is enabled on your mobile device.
  • Delete "T75" from your mobile device's Bluetooth history and attempt to re-pair.
  • Restart both the T75 (by unplugging and re-plugging) and your mobile device.
• Charging Not Working:
  • Ensure the charging cable is properly connected to both the T75 and your device.
  • Verify that your device supports QC3.0 for fast charging via the orange port.
  • Try a different charging cable or device to rule out cable/device issues.

7. Specifications

8. Safety Information

Please observe the following safety guidelines for proper usage, handling, and disposal of the device:

• Do not disassemble, repair, or modify the product.
• Avoid exposing the device to water, moisture, or extreme temperatures.
• Keep the device away from direct sunlight and heat sources.
• Do not drop or subject the device to strong impacts.
• Dispose of the device and its components responsibly according to local regulations.

9. Warranty and Support

LENCENT products are designed for reliability and performance. For any questions, technical support, or warranty inquiries, please contact LENCENT customer service through the retailer where the product was purchased or visit the official LENCENT website for contact information.