Navtelecom Signal S-2654 Manufacturer : Navtelecom GLONASS tracker with greatest usefulness and backing for 3G organizations Information Features Name Description Server Port 5393 3G modem External GLONASS/GPS and GSM antennas Built-in Li-Po battery 800 mAh 2 SIM cards Supports SD cards up to 32 GB Power protection and protection of input lines up to 200V 6 universal input lines 4 control output lines Interfaces: RS-232, RS-485, CAN and 1-Wire MODBUS support