Product voltage: self-powered (12V) car disc interface without external connection Size: 70 x 45 x 15(mm) Support decoding format: WAV /MP3/APE/WAVE/FLAC Support external: 1 USB2.0 / AUX Frequency response: 20-20K Hz Bluetooth version 5.0BR/ (compatible with versions below 5.0) Distortion: less than 0.05% Signal to noise ratio: more than the 90dB Standby power consumption: more than the 0.1W Working temperature -20 - +70 Celsius Working power: DC11-15V (generally taken from the host, no external power supply required) output: DC 5V/300mA car button function (or refer to the car manual) 1, CD-C, CD, DISC, , CD/AUX, etc. 2, DISC+/DISC-, etc. for the upper and lower discs (1-6) 3, short Track + / Track- , etc. for the upper and lower songs (1-99) 4, long Track + / for single repeat / sequential play switch 5, long Track - / random play 6, the volume, pause, mute and host operation are the same 7, Bluetooth priority, play U disk after disconnecting Bluetooth, no U disk switch to AUX. Use