CD-C, CD, DISC, SRC, CD/AUX, etc. DISC+/DISC-, etc. for the upper and lower discs (1-6)Short press Track +Seek / Track- Seek, etc. for the upper and lower songs (1-99). long press Track +Seek / for single repeat / sequential play switchlong press Track -Seek / random play. the volume, pause, mute and host operation are the same,Bluetooth priority, play U disk after disconnecting Bluetooth, no U disk switch to AUX.Use media software to convert AAC, APE, FLAC, OGG, DTS, WAV 5.1 and other formats into WAV playable formatBluetooth phone MIC defaults to running in the background, no matter which option can be used, press the previous song to connect to the phone, press a song to hang up the phone.Product voltage: self-powered (12V) car disc interface without external connectionSupport decoding format: 1 WAV / MP3Support external: 1 USB2.0 / AUXFrequency response: 20-20K HzBluetooth version 4.2 BR/EDR (compatible with versions below 4.2)Distortion: Less than 0.05%Signal to noise ratio: Greater than 90dBStandby power consumption: Greater than 0.1WWorking temperature -20 - +70CWorking power: DC11-15V (generally taken from the host, no external power supply required)USB output: DC 5V/300mAcar button function (or refer to the car manual)Material:ABScolour:BlackPackage Contents:1 x Module Unit1 x Wire Harness1 x Mic CableOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.