The VIS1225 (MDT-122) is a microprocessor-controlled "man-down" personal emergency transmitter designed for use by guards and security officers in prisons and institutions, or by people working alone in industrial and other high-risk facilities. The VIS1225 (MDT-122) is supplied with metal beltclip, lightweight water-resistant carry pouch or holster, and pull cord with cloth clip. Can be integrated into any alarm system. Fully Selectable supervisION WITH Superior transmission range. Smart anti-collision algorithm supports multiple simultaneous transmissions.