The MobileMule 5550 is a mobile DVR designed for on-board vehicle recording. It has four ports to record up to four cameras simultaneously and an ethernet port to connect a forward facing IP camera. The system comes with GPS to record the vehicle location and driving route as well. Footage records onto an included Western Digital 1TB hard drive with backup recording onto 1 SD card (sold separately) with a total storage capacity of 128GB. With a solid and compact build, the MobileMule 5550 is vibration-proof, installation-friendly and combines powerful functions together with a stable performance. ***Select the GPS+WiFi option to upgrade to live video remote viewing. This allows the DVR to connect to a WiFi hotspot in your vehicle. This model is compatible with jetpacks from all major carriers. Perfect for fleet tracking (can be used as a GPS tracker) and fleet management this DVR allows you to easily view and download footage even while the vehicle is on the road! Click here to learn more about connecting to a WiFi network. ***The GPS+WiFi+4G option allows the user to use a SIM Card for live remote viewing. This model can also be connected to a WiFi hotspot. Click here to learn more about connecting to a 3G/4G network.