Switch version: mode will automatically power off after 5 minutes of turning off the engine. Smart chip low-voltage protection belt switch, easy to install, plug and play. Intelligent supply step-down line, switch control 24-hour parking monitoring power supply and ignition start-up power supply with the car, automatically shut down after the flame is turned off 12V/24V to 5V OBD step-down cable, 3A output capacity, compatible with all models in the market. Flame-off and power-off + 24-hour monitoring. One line realizes two functions. mode input parameters: DC12.7V-40V Normal power mode input parameters: DC11.6V-40V Output parameters: 5V3A Line length: 20CM Interface: USB socket Line thickness: OD3.5mm You can get power from Car or Car battery ( 24hours ) this Switch for Power and Car battery power. "O" Mode is power Power by , 5 minutes after engine stop, it will be cut off. "--" Mode is Car battery power power 24 hours by Car battery, with low electricity protection. your Car DVR will still keep recording video after you turn off car. So donot need to worry about your car being scratched or hit by others in the parking lot but you donot know who note: Different batches, "OBD" or "OBD " on the label will be sent randomly, 't accept the specified Colour:black Material:plastic+metal Package Contents: 1 x Mini USB OBD Car Charger Only the above package content, other products are not included. Note: Light reflection 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.