Type:Mobile DVR Use:Automotive Function:to Viewer Warranty:1 Years GSM:3g 4g wifi GPS:SIRF IV GPS sensitivity:-159dB vdio input:4 8 channels Audio Compression:G711A Vression:H.264 Interface:1RJ45, 3RS232,2 RS485,2 CAN port,2USB Port Storage:MAIN ram: SATA interface, support 1T capacity vtion:CIF HD1 D1 for option vback:support local,PC playback, SW playback