Trilogy economical audit trail security lock provides keyless entry for up to 200 users. 1000 event audit trail log, time-stamped by day, date, time and user. 150 scheduled automatic lock/unlock events,etc. 200 user codes: Master, manager, supervisor and basic users. Also one-time service code (3-6 digits). Weatherproof -31 Deg. to +151 Deg. F (-35 Deg. to +66 Deg. C). Relay may be programmed to energize on one or more selected events.