... Video Resolution:1280x1024,4 Channels D1 Real-time SD Card Mobile DVR with GPS MAIN FEATURES 1. High video quality ... RCAAUDIO LEVEL1V ~2V, p-pAUDIO COMPRESSIONG.711 STORAGESTORAGESD card, external USB device(memory stick or hard drive)FILE ... port, 1 RS485 Port NETWORKRJ45,10M/100MGPSSupport GPS receiver(optional), can record GPS information along with video ... REMOTE OPTIONAL ACCESSORY:1 x GPS RECEIVER