Victron Energy GX LTE 4G-A Cellular Modem f/GX Devices - North America Only One Size. It is a cellular modem that supports 2G 3G and 4G technologies. It provides mobile internet for the system and a connection to the Victron Remote Management (VRM) portal. Built-in GPS ReceiverThe GX LTE 4G includes a built-in GPS receiver. When the optional active GPS antenna is installed the system can be tracked as well as geo-fenced on the VRM Portal. The required accessory part number is GSM900200100 - Active GPS Antenna for GX GSM. GX CompatibilityThe GX LTE 4G can be used with any of the GX devices and requires Venus OS v2. 60 or newer to be installed on the GX device. SIM CardIt requires a SIM card in the Mini-SIM format. When to Use a Mobile Router InsteadThe GX LTE 4G provides an internet connection for the GX device only. There is no option to share the internet with laptops phones or other devices. For installations where more devices need internet such as a yacht or RV consider installing a mobile router instead. Antennas and AccessoriesA small indoor LTE antenna is included. Optionally Victron sells an outdoor LTE antenna which increases the range. Part number GSM900100400 - Outdoor 4G GSM Antenna. Package Contents: Victron Energy GX LTE 4G-A Cellular Modem f/GX Devices - North America Only Victron Energy GSM100200400: GX LTE 4G-A Cellular Modem f/GX Devices - North America Only One Size