LENCENT C72 Bluetooth FM Transmitter User Manual

1. Introduction

The LENCENT C72 Bluetooth FM Transmitter is designed to enhance your in-car audio experience by providing wireless music streaming, hands-free calling, and multi-device charging capabilities. This device plugs into your car's cigarette lighter socket and transmits audio to your car radio via an FM frequency. It supports various audio sources including Bluetooth-enabled devices, USB flash drives, and TF (microSD) cards.

2. Product Features

• Bluetooth 5.0 Connectivity: Ensures a stable and fast connection for audio streaming and hands-free calls.
• Multiple Music Playback Modes: Supports Bluetooth, U Disk (USB flash drive up to 32GB), and TF Card (microSD card up to 32GB).
• Triple Charging Ports: Equipped with one USB-C port and two USB-A ports for simultaneous charging of up to three devices.
• Hands-Free Calling: Built-in microphone allows for safe and convenient call management with a single button.
• Voltmeter Function: Monitors your car battery voltage for safety and awareness.
• 7-Color LED Ambient Lights: Customizable lighting options to match your car's interior or personal preference.
• CVC Technology: Provides anti-interference performance for clear audio.

3. Setup Instructions

1. Insert the Transmitter: Plug the LENCENT C72 into your car's 12V/24V cigarette lighter socket. The device will power on automatically, and the LED display will show the current car battery voltage for a few seconds before displaying the FM frequency.
2. Tune Your Car Radio: Tune your car's FM radio to an empty frequency (one with no active broadcast). Choose a frequency that is clear and free of static.
3. Set Transmitter Frequency: Press the 'M' button on the transmitter to enter FM tuning mode. Use the navigation buttons (left/right arrows) or the multi-function knob to adjust the transmitter's frequency to match the empty frequency on your car radio.
4. Pair via Bluetooth:
   • On your mobile device, enable Bluetooth.
   • Search for available Bluetooth devices and select 'C72' from the list.
   • Once paired, you will hear a confirmation tone, and the device will be ready for audio streaming.

An overview of the LENCENT C72 Bluetooth FM Transmitter, showing its main display, control buttons, USB-A ports, and USB-C port.

4. Operating Instructions

4.1 Music Playback

The LENCENT C72 supports three methods for playing music:

• Bluetooth Streaming: After successful Bluetooth pairing, open your music player app on your mobile device. Audio will be transmitted wirelessly to your car's speakers via the set FM frequency.
• U Disk (USB Flash Drive): Insert a USB flash drive (up to 32GB, formatted as FAT32) containing MP3/WMA/WAV/FLAC audio files into the designated USB port. The transmitter will automatically detect and play music from the U Disk.
• TF Card (MicroSD Card): Insert a TF card (up to 32GB, formatted as FAT32) containing MP3/WMA/WAV/FLAC audio files into the TF card slot. The transmitter will automatically detect and play music from the TF card.

Use the navigation buttons (left/right arrows) on the transmitter to skip tracks. The multi-function knob can be rotated to adjust volume.

This image illustrates the three available music playback methods: direct connection via U Disk (USB flash drive), TF Card (microSD card), and wireless streaming via Bluetooth 5.0 from a connected smartphone.

4.2 Hands-Free Calling

When a call comes in during music playback, the transmitter will automatically switch to hands-free mode. Use the multi-function button (usually the central knob) to manage calls:

• Answer Call: Press the multi-function button once.
• Reject Call: Press and hold the multi-function button for 2 seconds.
• End Call: Press the multi-function button once during a call.
• Redial Last Number: Double-press the multi-function button.

4.3 Device Charging

The LENCENT C72 features multiple charging ports:

• USB-C Port: For fast charging compatible devices.
• USB-A Ports: Two standard USB-A ports for charging other devices.

Connect your devices using appropriate charging cables to the respective ports. The transmitter can charge up to three devices simultaneously.

The image displays the charging ports of the LENCENT C72, including a USB-C port and two USB-A ports, emphasizing its ability to charge devices up to 2.5 times faster than standard chargers.

4.4 Voltmeter Function

Upon plugging in, the C72 displays your car battery's voltage. This feature helps you monitor the health of your car battery. Typical voltage ranges are:

• 13.2V to 14.7V: When your car is on and moving.
• 12.2V to 12.8V: When your car is parked and ignition is off.

4.5 LED Ambient Lights

The transmitter features a 7-color LED light ring. The color can typically be changed by pressing a dedicated light button or cycling through options via the multi-function button (refer to specific button labels on your device if available).

This image showcases the LENCENT C72's seven-color LED light ring, which provides customizable ambient lighting options for the car interior.

A technical diagram highlighting the integrated Bluetooth 5.0 chip, which ensures faster pairing, a more stable connection, and improved audio quality for wireless streaming.

5. Troubleshooting

• No Power: Ensure the transmitter is securely plugged into the car's cigarette lighter socket. Check if the car's power outlet is functioning.
• Static or Poor Audio Quality:
  • Change the FM frequency on both the transmitter and your car radio to a different, clear, and unused frequency.
  • Ensure the volume on your mobile device and car radio is set appropriately.
  • Move away from strong radio signals or interference sources.
• Bluetooth Connection Issues:
  • Ensure Bluetooth is enabled on your mobile device.
  • Forget the 'C72' device from your mobile device's Bluetooth settings and attempt to re-pair.
  • Restart both your mobile device and the FM transmitter.
• U Disk/TF Card Not Playing:
  • Ensure the U Disk or TF card is formatted as FAT32.
  • Verify that the audio files are in a supported format (MP3, WMA, WAV, FLAC).
  • Check if the U Disk or TF card is inserted correctly and securely.
• Charging Not Working: Ensure the charging cable is properly connected to both the transmitter and your device. Check if your device's charging port is clean and undamaged.

6. Specifications

The product label on the LENCENT C72, indicating the model number C72, input voltage (DC 12V-24V), and manufacturing details.

7. Maintenance

• Keep the device dry and away from moisture.
• Do not expose the device to extreme temperatures.
• Clean the device with a soft, dry cloth. Avoid using harsh chemicals or abrasive cleaners.
• Ensure the cigarette lighter socket and the transmitter's contacts are free from dust and debris for optimal connection.

8. Safety Information

• Do not disassemble or modify the device.
• Avoid operating the device in a manner that distracts you from driving.
• Keep out of reach of children.
• Ensure the device is securely plugged in to prevent it from becoming a projectile during sudden stops.
• Do not expose to open flames or extreme heat.

9. Warranty and Support

LENCENT products are designed for reliability and performance. For warranty information, technical support, or any inquiries regarding your LENCENT C72 Bluetooth FM Transmitter, please refer to the contact information provided with your purchase or visit the official LENCENT website.