he Alarm Lock DL3500CRL26D is a left-hand digital mortise lock designed for classroom use, featuring a satin chrome finish and robust access control capabilities. It supports up to 300 user codes across multiple access levels (master, manager, supervisor, and basic), and offers fingertip or PC-based programming. With a real-time clock, it enables up to 500 scheduled events and holiday schedules, while a 40,000-event audit trail logs all activity with time/date stamps. The lock operates on a 5AA battery pack with up to 80,000 cycles, includes a low-battery alert, and is weatherproof for extreme conditions. Additional features include quick passage mode, multi-level user codes, one-time service codes, and a vandal-proof all-metal keypad. It retrofits most cylindrical locksets, supports card enrollment without a PC, and is field reversible for opposite handing.