Coban GPS306 is a vehicle OBDII GPS tracker working over GSM/GPRS networks (850/900/1800/1900Mhz) and GPS satellites. The device features mainteanance remind alert, low battery alarm, external power off alarm, GPS blind spot alert, geo-fencing, multi-area management, movement alarm, overspeeding alarm, voice monitor, sleep mode, sleep by time, sleep by shock sensor, GPS drift suppression, and more.