... sd max; 4. 4CH Dual Camera Car DVR factory 4CH DUAL SD CARD DVR 4CH Dual Camera Car DVR factory With G- ... such as: RS485, RS232, differential speed interface >> Car black box function, recording speed, position, momentum, acceleration, temperature, brake, reverse, ... °C More Pictures for this 4CH Dual Camera Car DVR factory : Applications : 4CH Dual Camera Car DVR factory 4CH Dual Camera Car DVR factory