H.264 ,1-4 channel Mobile DVR Mini size ,Support max 64 GB sd card 3g Live view and GPS live tracking Model:M602Feature.Embedded Linux operating system using H. 264 format, compression ratio, the image is clear ;.4 channel video input (air connector), 1 channel RCA ;. 4 channel audio input (air connector), 1 channel audio output ;. Built-in GPS, Built-in wireless module like 3G (EVDO, WCDMA,HSPA, ...