... 3.Size: 25.4*25.4*3. GPS GSM tracker module with Low Price, High Performance, International Approvals, Prompt ... power input:3.3V DC for main power and RTC power 2).Input current: Less than 35mA ... ).Two full duplex serial communication, TTL interface, with user selectable baud rate (4800,9600,19200,38400 ... output (GGA, GSA, GSV, RMC (VTG ,GLL and ZDA for optional)) 3).SiRF binary:position, velocity, ...