Alarm Lock's standalone Trilogy Locks provide safe, convenient keyfob-activated classroom lock-down, from safely inside the classroom, with a typical range of up to 100'. A favorite in K-12s, colleges and universities for their easy deployment and dependable, affordability, field-proven Trilogy locks are both advanced and rugged Grade 1. Starting with the cylindrical DL3200 or PDL3000, and Mortise P/DL3500 Series, each lock can support up to 50 tiny keyfobs, used with the Trilogy Remote Release Kit.