Car mobile stand alone DVR 1.Video signal:four channels input, one channel output 2.Resolution:display:720x576 Video record:640x272 3.Audio signal: with one channel audio 4.Hdd:support one 2.5inchhdd, 400g at most 5.Usb interface or fetch hdd case to connect with computer usb interface 6.Power input:dc 12v or 24v, range 8-36v, working power