... Compression,Video Resolution:1280x1024,4 Channels D1 Real-time SD Card Mobile DVR with GPS MAIN FEATURES 1. High video ... .7. Support automatic record, event trigger record, schedule record.8. Can record speed with audio and video. Support overspeed alarm ... channel, 500Ω, RCAAUDIO LEVEL1V ~2V, p-pAUDIO COMPRESSIONG.711 STORAGESTORAGESD card, external USB device(memory stick or hard drive)FILE FORMATAVI ...