MT90 is the first Meitrack tracking GPS that works with SiRFStar IV GPS and quad-band GSM 850/900/1800/1900 Mhz base station, making it easy for bi-module positioning technology. Using this advanced technology, the MT90 can track your location more accurately and precisely. Equipped with an SOS button, people using the MT90 tracking device are just one click away from calling the Rescue Service Center for help. In addition, the SOS button can be programmed to call multiple emergency numbers until one is answered. This device can facilitate two-way communication, along with the listen-in option, which can be useful when discreetly trying to locate a missing person. The MT90 GPS tracker uses the Meitrack protocol for tracking via SMS and GPRS. The MT90 has a motion sensor, built-in battery, blind area GPS alarm, low battery alarm, and speed limit alarm.