... /HD1/CIF optional>> H.264 video compression of 4CH Dual Camera Car DVR factory , Linux operating system, dual-stream >> ... functional >> Dual SD card storage with the 4CH Dual Camera Car DVR factory , single card to support a maximum ... black box function, recording speed, position, momentum, acceleration, temperature, brake, reverse, turn, alarm and other important information. >> DC8V ~ 36V wide ...