Introduction: The device is in-car MP3 player, equipped with good performance MP3 decoder chip. It can transmit and play stereo music from the TF card to the car audio through the FM radio signal. It can transmit music from mobile phone to the car audio. The device sends the signal wirelessly, no need to modify your car. Features: 1. Start the car, the screen will display the car battery voltage. 2. CVC technology to control noise and storm then to create full-duplex sound quality 3. Support the phone's A2DP function, the phone will play music directly when connecting 4. When the device is switched on, the phone can automatically connect 5. Support external TF card, can play MP3/ WMA format music files 6. Intelligent charging and high-pass fast charging program output, can be applied for car handheld equipment charging 7. Orange USB port supports QC3.0 PROTOCOL: DC3.5-6.5Volts/ 3A, 6.5-9Volts/ 2 A, 9-12 Volts/ 1.5 A 8. Blue USB port supports intelligent output current: 5 Volts/ 2.4 MA 9. Sound quality-Using the most advanced interference and noise cancellation technology to provide the most perfect sound quality. Turn off the FM transmitter: When no need to use the FM function, long pressing the next song key for 5 seconds, it will turn off the FM functions, the screen will be dark and keep charging function. Specifications: Vision: V4.2+EDR Frequency: 2.4 GHZ Sensitivity: -42 dB+/3 dB 360 Effective range: 5 Meter RF output: 4 dBm FM frequency: FM: 87.5MHZ-108.0MHZ Effective range: 2 Meter Package includes: 1 x In-car FM transmitter compatible with Bluetooth 1 X 3.5mm Audio cable 1 X 3A fuse 1 x User manual Note: the mention of brand name above is only for purposes of demonstrating compatibility.