... 4CH DUAL SD CARD DVR 4CH Dual Camera Car DVR factory With G-Sensor/ GPS optional 1SD CARD / 2 SD CARD ... channel (2D1+2CIF / 4 HD1 / 4CIF)1 SD card +G-SENSOR +GPSAS-BW1002-S24 channel (2D1+2CIF / 4 HD1 / 4CIF) ... >> Rich peripheral interfaces, such as: RS485, RS232, differential speed interface >> Car black box function, recording speed, position, momentum, acceleration, temperature, brake, reverse, turn ...