Contactless RFID card access for fast and secure entry. Mechanical key override for emergency and backup access. LED indicators to show lock status and card validation. Low maintenance with easy battery replacement. Support for multiple user groups (guests, staff, housekeeping). Audit trail function to record and monitor access history. Support Temic T5557 Card. Powered by 4 pieces 1.5V Alkaline batteries. Privacy Deadbolt inside the door to make sure double security.