1-4 channels Car DVR H.264 Compression Support 3G, GPS, WIFI Support CIF,HD1,D1 resolution Support 2 SD Card Car DVRFunctionItemDescriptionRecording SystemChannel1-4 channelsResolutionSupport ... : x 2,x4,x8,x16.GUIGraphical User InterfaceSetup system parameters with the remote control.AlarmInputSupport up to 4 channels alarm input ...