FM-Eco4+ light 3G T is a tracking device (3G/2G) with regular housing, small size and internal antennas.
FM-Eco4+ 3G T is a tracking device (3G/2G) with rugged IP67 certified housing that can be installed outside the cabin and successfully resist environmental factors such as water and dirt.
FM-Eco4+ 3G E T is a tracking device (3G/2G) with rugged IP67 certified housing and an external antenna, which allows the device to be installed in areas that are hard to find and access.