Input Voltage: Adapter Voltage step down switcher harness work as input 12V to16V; Won't work for wider voltage; NOTE: DO NOT WORK AS A BYPASS Output Voltage: There are three voltage slots, representing a 3.3V 5V 6V 9V power supply; According to your automotive equipment requirements Application: DC converter wiring harness is widely used in vehicles electronic systems; Such as power factory camera or to remove popping noise for car when install aftermarket radio stereo, Install dash cam, CB or power other car accessories devices Premium Quality: Adjust voltage 12V to 3.3V 5V 6V 9V step down converter made of professional electrical level copper wire materials, Strong conductivity; Prevent car equipment from damage due to over voltage, Short circuit Easy installation: Only 4 wires need to be connected; No need to cut any factory wire harness; Wiring diagram is included in the package