The GV-8620 has a TTFF time at Hot start of less then 1 s, Warm start of 30 s, and Cold start of 33 s, and can operate between -40°C to + 85°C, while only consuming 68 mA of power in Acquisition mode. The GV-8720 has a TTFF time at Hot start of less then 1 s, Warm start of 30 s, and Cold start of 33 s, and can operate between -40°C to + 85°C, while only consuming 72 mA of power in Acquisition mode.