4-way audio and video input resolution D1/HD1/CIF optional H.264 video compression, Linux operating system, dual-stream The digital watermarking functional Dual SD card storage, single card to support a maximum capacity of 64GB Built-in GPS module optional Dynamic detection 8 seconds delay the power data protection, prevent momentary power failure caused the loss of data and storage of file corruption Rich peripheral interfaces, such as: RS485, RS232, differential speed interface Car black box function, recording speed, position, momentum, acceleration, temperature, brake, reverse, turn, alarm and other important information. DC8V ~ 36V wide voltage power supply, the industry standard embedded design, metal aluminum casing, low power Operating temperature -25 ℃ to +85 ℃