Alarm Locks Trilogy Series, the number one selling electronic standalone access locks in their class, now adds this new LD Lock-Down model designed as an easy to implement solution in the school security epidemic. For peace of mind, at the first sign of trouble, faculty & staff can remotely press their pocket-sized keyfobs button to lock out unauthorized access, instantly locking-down a classroom or area, while all can remain safely within the room. For multi-classroom users, up to 50 keyfobs can be supported on each lock and each keyfob can control up to four locks for remote lockdown activation, up to 100 away.