PLCM3550WIR 1, Long press for power ON/OFF; Short press for Video1/Video2 switch. 2, Positive Adjustment 3, Menu 4, Negative Adjustment PLCM3550WIR 5, DC power input 6, Optional AV input Monitor PLCM3550WIR Cigarette plug +12v -12v Taillight Camera Video Transmitter Discover other cameras & driver safety on our website.