Use the buck line to not occupy the cigarette lighter interface. First, connect the negative pole(black line) of the buck line to the ground of the car fuse box; Secondly, if you want to continue monitoring after parking (the DVR works 24 hours), connect the positive pole(red line) of the buck line to the BAT interface of the car fuse box; If you want to stop monitoring after parking (the DVR does not work after parking), connect the positive pole of the buck line to the fuse box ACC interface. Specification: Output voltage: 5V Output current: 2.5A Low Voltage Protection: 11.6V Output interface: Mini usb Can be used for: 70mai Dash Dam 4K A800S 70mai Dash Dam Pro Plus+ A500S 70mai Dash Cam Lite D08 70mai Dash Cam A400 70mai Dash Cam Wide Mirro D07 70mai Dash Cam M300 70mai Dash Cam 1S D06 (Not for parking but for power supply) If you are worried about your car being damaged by someone else after parking, you can use our buck line to connect the DVR to ensure that the recorder works 24 hours.If someone else hurts your car and the shock triggers the G-sensor, the DVR will immediately turn on and record the situation. Material: plastic colour: Black Package Contents: 1 x Parking Surveillance Cable 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.