... Compression,Video Resolution:1280x1024,4 Channels D1 Real-time SD Card Mobile DVR with GPS MAIN FEATURES 1. High video ... channel, 500Ω, RCAAUDIO LEVEL1V ~2V, p-pAUDIO COMPRESSIONG.711 STORAGESTORAGESD card, external USB device(memory stick or hard drive)FILE FORMATAVI ... sensor, 1 ignition sensor, 3 sensors for brake, return etc.COM PORT2 RS232 port, 1 RS485 Port NETWORKRJ45,10M/100MGPSSupport GPS ...