Using the latest technology, including asset tracking software and ultra-low power modes, the GPS Tracker 90 OYSTER can operate for up to 4 years without changing batteries. With an incredible battery life of up to 4 years, the GPS Tracker 90 OYSTER can be attached to assets and tracked without changing batteries. The GPS Tracker 90 OYSTER has built-in antennas for GPS reception, a high-performance GPS that can track both GPS and GLONASS satellites simultaneously and flash memory for storing non-volatile information.