Bluetooth car MP3 player with built-in FM transmitter, MP3 decoder, and stereo Bluetooth wireless transmission chip. Plays o or songs from TF card, USB drive, and mobile phone through your car stereo without modifying your vehicle, allowing you to enjoy music while driving and use hands-free calling. Product features: - Play songs from USB flash drive and TF card - Stream o and stereo music from mobile phone to car stereo via Bluetooth A2DP technology - Supports HFP/HSP, OPP, A2DP/AVRCP, and PBAP Bluetooth protocols - FM transmission frequency range: 87.5–108.0 MHz - Bluetooth hands-free function with DSP echo cancellation - USB interface provides charging for various mobile phones with 1A charging current - Wide voltage input 12V–24V, compatible with most vehicles Functions: - Answer/end calls - Connect to mobile music and navigation apps via car system - Previous/next track control - Play/pause music - Volume adjustment - Call redial - Support for USB flash drive and TF card playback - Dual USB ports for charging two devices simultaneously - Short-circuit, overload, and overcharge protection How to use: 1. Plug the device into the car’s cigarette lighter socket and start the engine to power on. 2. Tune both the car radio and the device to the same unused FM frequency (e.g., 87.5 MHz). Use the [CH] button to adjust the device frequency. 3. Enable Bluetooth on your phone, search for "BT-Car", and pair the devices. Once connected, phone o will play through the car speakers. TF/USB Music Playback: - Insert TF card or USB drive to automatically play music - Long press [Answer] button to switch between USB, TF, and Bluetooth modes Bluetooth Mode: While playing music: - Single press [Previous/Next] to change tracks - Single press [Phone] button to play/pause - Long press [Previous/Next] to increase or decrease volume During a call: - Short press [Answer] button to answer or end a call - Long press [Answer] button to reject an incoming call - Double-click [Answer] button to redial the last number Specifications: - Rated voltage: 12–24V - Working power: 0.5W - Operating temperature: -10°C to 70°C - Humidity range: 0%–90% (non-condensing) - Frequency response: 20Hz–15kHz - o format: MP3 - Supported Bluetooth protocols: HFP/HSP, OPP, A2DP/AVRCP, PBAP - Signal-to-noise ratio: 68dB - Bluetooth version: 3.0 + EDR - Bluetooth o profile: A2DP (Advanced o Distribution Profile) - Bluetooth transmission range: 10–15 meters - FM transmission frequency: 87.5–108.0 MHz - USB charging output: 5V/1A Package included: 1 x Bluetooth receiver 1 x User manual