MT-90 is a waterproof (IP67), small, light gps tracker. Easy to take and specially designed for children, old man, disabled people and dog / pet.Personal tracking devices are valuable for commercial or private applications. Some tracking devices for people, like a teen tracker, are suitable for covert tracking, small enough to be hidden in a bag or purse. Other personal GPS tracking devices are perfect for individuals entering dangerous areas, with features like panic alerts. Those with special needs can benefit from a GPS locator that enable caretakers to find them if they wander and become lost. A GPS tracker for elderly patients and children with special needs is a surefire way to keep track of those who need extra care.A GPS logger can give you after-the-fact location information telling you where your loved ones have been.Through GPS and GSM or GPRS communication, MT-90 can get its position and send the position data to your telephone or sever for personal tracking.MT-90 supports SOS button to send SMS alarm for rescue.