... Optional. Model No.: KT7CFR (7" 5-video/4-way DVR Truck Surveillance CCTV System)1, 9V-40V ... adjust;8, 4-Way DVR / 5-Video frequency input for truck Survennice CCTV System display; GPS and ... for Safty. Fit for all vehicles such as Bus, Truck, Trailer, Caravan, Vans (Agriculture, Construction, Recreation, ... quantity.) KT7CFR 7" 4-way DVR 5-video Input Truck Surveillance CCTV System Car Rearview System also ...