Use the buck line to not occupy the 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() 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: Dash Dam 4K A800S Dash Dam + A500S Dash Cam Lite D08 Dash Cam A400 Dash Cam Wide D07 Dash Cam M300 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 that the recorder works 24 hours.If someone else hurts your car and the shock triggers the G-sensor, the DVR 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.