Rugged clutch mechanism and Grade 1 durability ensure long life 150 scheduled events, including 4 "quick schedules" for programming the 4 most common time schedules in one step 2000 user codes including: Master, manager, supervisor and basic user. Also one-time entry service code Weatherproof performance, water-sealed for use inside and out, with operational temperature range of +151??F to -31??F (+66??C to -35??C) Entry allowance from 5-15 seconds Greater security with "temporary keypad lockout" after 3 unsuccessful code-entry attempts 40,000 event audit trail with time/date stamp for a printable record of door access activity by user Real time clock allows logging of events to within 1 second of accuracy Programmable relays energize when one or more selected events occur 4 time-out functions allow a user to enable other users or unlock the lock for some time period without needing to return to the lock Easy to install in about an hour. Retrofits most cylindrical