... sensor optional.2 SD Card slots optional,VOIPl Built-in wireless module like 3G (EVDO, WCDMA,HSPA, HSDPA, TD-SCDMA…), GPRS… ... to induce the vehicle X, Y, Z axis3G,WIFI Wireless transmissionBuilt-in wireless module optional. Such as 3G EVDO, HSPA, HSDPA, WCDMA… ... 5APower consumNormal working state <5W, Idle state<0.5WPower-off data protectionSpecial UPS technique that the machine can still record video ...