Note: please confirm if the voltage fit and then install.Our prodcut working on 12V only. Please confirm the installation size of your car. Installation notes: Please refer to the installation and wiring diagram Install the metal sleeve:Refer to the installation diagram,insert the metal frame insert he instrument panel,and use the screwdriver to eject the card on the metal sleeve to secure the position. Power and grade: Positive level connect to car battery positive,negative level connect to ground(battery negative or bottom of the car,note:in order to prevent short circuit,connecting the battery negative after all installed) Specification : Support USB/TF card reader Support audio: MP3/WMA/WAV formats and so on. Support folder play function Support remote control. Rotary electronic volume control MP3 play supports pause /preview/repeat/random play and 10 tracks up/down selections. Electronic type bass/treble/left and right balance/front and back balance volume control Front AUX audio