Car DVR Black Box 1.vandal-proof, waterproof,dustproof 2.HDD/SD ... 4.real time recording 4CH H.264 HD Real Time Car DVR Black Box with GPS/GPRS/3G Network AK-6204GMain Features ... flaw adjustable,recording OSD can add such as time\car plate number\speed; *DVR+GPS module+3G module/2G module+software sever ... recording after re-powered 4CH H.264 HD Real Time Car DVR Black Box with GPS/GPRS/3G Network AK-6204G