feature: 1. Bluetooth answer, hang up, reject, redial and other functions. 2. Support Bluetooth stereo music playback. 3 digital tube display 4 Support car battery voltage detection. 5 Support U disk playback (1G-32G). 6 Support TF card music playback (1G-32G)). 7. Support MP3/WMA/WAV format music 8 Support FM full-frequency transmission function 8.7.5-108.0MHZ. 9. Automatic shutdown memory function. 10. U disk interface supports 5V/1A mobile phone charging. 11 Support 5V/2.4A mobile phone charging. 12 Support mobile phone navigation voice prompts. 13 Support charging identification. Specification: 1. Product Type: Built-in Stereo FM Transmitter for Vehicles 2. Material: ABS 3 colors: black 4 Bluetooth: V4.2 5 Bluetooth audio processing: with A2DP (Advanced Audio Distribution Profile) function 6 Rated working voltage: 12V24V 7. Limit working voltage: 8-32V 8 USB 1 output: 5V/1A 9. USB 2 output: 5V/2.4A 10 Support music formats: MP3/WMA/WAV 11 Support U disk capacity: 1G-32G 12 Support TF card capacity: 1G-32G 13 TF card: maximum support 64G (not included) 14 Working temperature: <70 degrees 15 Battery voltage accuracy: error 1V 16 Signal-to-noise ratio: >60dB 17 levels of distortion: <0.1% 18 frequency response: 20Hz-20Khz 19 left and right channel separation: >60dB 20 Bluetooth transmission distance: less than 10m 21. Effective distance of Bluetooth microphone: 0.5-2m 22 FM radio frequency: 87.5 MHz-108.0 MHz 23. Effective launch range: 2 meters This includes: 1 x Bluetooth car charger