1. Introduction
This manual provides detailed instructions for the LENCENT BT25 Bluetooth 5.0 FM Transmitter. It covers setup, operation, maintenance, and troubleshooting to ensure optimal performance and user safety. This device allows you to stream music, make hands-free calls, and charge devices in your vehicle.
2. Safety Information
Important Safety Guidelines:
- Use caution when operating this device while driving.
- Follow all local laws regarding the use of electronic devices in vehicles.
- Keep the device away from extreme temperatures and moisture.
- Refer to this user manual for proper usage and additional safety information.
- Ensure the device is securely plugged into the car's cigarette lighter socket.
- Do not disassemble or attempt to repair the device yourself. Contact customer support for assistance.
3. Product Overview
The LENCENT BT25 Bluetooth 5.0 FM Transmitter is designed to enhance your in-car audio experience. It features:
- Bluetooth 5.0 for stable wireless connection.
- PD 20W Type-C and QC 3.0 USB charging ports for fast charging.
- Built-in CVC noise-canceling microphone for clear hands-free calls.
- Support for music playback via Bluetooth or USB flash drive (up to 64GB).
- 9-color LED ambient lighting with multiple modes, including a light-off option.
- One-key bass boost function for enhanced audio.
- Compatibility with 12-24V car cigarette lighters.
Components:
- PD 20W Type-C Port
- QC 3.0 USB Port
- USB Music Playback Port (Blue)
- Multi-function Knob (Volume/FM adjustment/Track control)
- Call Button (Answer/End/Reject calls)
- FM Button
- Bass Boost Button ('b' button)
- LED Light Ring
4. Setup
4.1 Powering On and Initial Setup
- Insert the LENCENT BT25 FM Transmitter into your car's 12V/24V cigarette lighter socket.
- The device will power on automatically, and the LED display will show the car battery voltage for 3 seconds, then display "bt" (Bluetooth mode) and the FM frequency.
- Tune your car radio to an unused FM frequency. Choose a frequency that does not have an active broadcast to minimize interference.
- Press and hold the "FM" button on the transmitter until the frequency on the LED display starts flashing.
- Rotate the multi-function knob to match the transmitter's frequency with your car radio's frequency.
4.2 Bluetooth Pairing
- On your smartphone, enable Bluetooth and search for available devices.
- Select "BT25" from the list of devices to pair. The device name is typically "BT25" as indicated in the user guide.
- Once successfully paired, the transmitter's LED display will show "bt" steadily, indicating a successful connection.
Video 1: Official product video demonstrating the setup and pairing process of the LENCENT Bluetooth 5.0 FM Transmitter.
5. Operating Instructions
5.1 Music Playback
You can play music through the transmitter using two methods:
- Bluetooth Streaming: After successful Bluetooth pairing, open your music app on your smartphone and start playing music. The audio will be transmitted to your car's FM radio.
- USB Flash Drive: Insert a USB flash drive (up to 64GB) containing MP3/WMA/WAV/FLAC files into the blue USB port (marked with a music note icon). The transmitter will automatically detect and play music from the drive.
Controls:
- Play/Pause: Press the multi-function knob.
- Next Track: Press the ">>|" button.
- Previous Track: Press the "|<<" button.
- Volume Adjustment: Rotate the multi-function knob clockwise to increase volume, counter-clockwise to decrease.
- Bass Boost: Press the 'b' button to activate or deactivate the deep bass mode.
5.2 Hands-Free Calling
The built-in microphone allows for clear hands-free communication.
- Answer Call: Press the green call button once.
- End Call: Press the green call button once during a call.
- Reject Call: Press and hold the green call button for 2 seconds.
- Redial Last Number: Double-press the green call button.
- Activate Voice Assistant (Siri/Google Assistant): Press and hold the green call button for 2 seconds when not on a call.
5.3 Device Charging
The transmitter is equipped with multiple charging ports:
- PD 20W Type-C Port: For fast charging compatible devices (e.g., iPhone, iPad Pro).
- QC 3.0 USB Port: For fast charging Quick Charge 3.0 compatible Android devices.
5.4 LED Lighting Control
The device features a multi-color LED light ring. To change the LED color or turn it off:
- Press and hold the 'b' (bass boost) button until the LED light starts flashing.
- While flashing, press the ">>|" (next track) button to cycle through the available 9 colors (red, blue, green, yellow, purple, cyan, white, rainbow, rainbow flow) and the light-off option.
- Once you select your desired color or turn off the light, stop pressing buttons. The light will stop flashing and remain on the selected color or off.
6. Maintenance
To ensure the longevity and optimal performance of your LENCENT BT25 FM Transmitter, follow these maintenance guidelines:
- Cleaning: Use a soft, dry cloth to clean the device. Do not use liquid cleaners or aerosols, as they may damage the device.
- Storage: When not in use for extended periods, store the device in a cool, dry place away from direct sunlight and extreme temperatures.
- Handling: Avoid dropping the device or subjecting it to strong impacts.
- Power Source: Always ensure the device is properly inserted into a 12-24V car cigarette lighter socket.
7. Troubleshooting
If you encounter issues with your LENCENT BT25 FM Transmitter, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| No power/Device not turning on. | Loose connection; Car cigarette lighter not working; Blown fuse in car. | Ensure the transmitter is firmly plugged in. Check if the car's cigarette lighter is functional. Consult a mechanic if the car's fuse is suspected. |
| Poor audio quality/Static. | FM frequency interference; Volume too low/high; Bluetooth connection issue. | Change to a different, unused FM frequency on both the transmitter and car radio. Adjust volume levels on both devices. Re-pair the Bluetooth connection. |
| Bluetooth not connecting. | Bluetooth not enabled on phone; Incorrect device selected; Device already paired to another phone. | Ensure Bluetooth is active on your phone. Select "BT25" from the list. Disconnect from other devices if necessary. |
| USB music not playing. | USB drive not inserted correctly; Unsupported file format; USB drive corrupted. | Ensure the USB drive is fully inserted into the blue USB port. Check if music files are in supported formats (MP3/WMA/WAV/FLAC). Try a different USB drive. |
| Hands-free call quality is poor. | Environmental noise; Microphone obstruction; Low volume. | Ensure the microphone area is clear. Adjust call volume. Try to minimize background noise. |
8. Specifications
- Model Number: BT25
- Bluetooth Version: 5.0
- Input Voltage: 12-24V
- USB-C Output: PD 20W
- USB-A Output: QC 3.0 (18W)
- USB Music Port: Supports USB flash drive up to 64GB
- Supported Audio Formats: MP3, WMA, WAV, FLAC
- FM Frequency Range: 87.5-108.0 MHz
- Product Dimensions: 2.02 x 1.9 x 3.03 inches
- Item Weight: 2.8 ounces
- Material: Plastic
- Special Feature: Bluetooth FM Transmitter
9. Warranty and Support
LENCENT products are designed and manufactured to the highest quality standards. This product comes with a standard manufacturer's warranty. For detailed warranty information, product support, or technical assistance, please visit the official LENCENT website or contact their customer service team.
Manufacturer: LENCENT Technology Co.,Ltd.
Online Support: Visit the LENCENT Store on Amazon
