New Version Digital Door Lock Security 2pcs of RFID Cards And 2pcs of Emergency keys Silver color RF hotel lock system Zinc alloy material,Size:153*79*69mm New model Smart design, ANSI standard.Easy to install. Use 4 pieces of AA batteries.Battery can use 20,000 times. With low power alarm.Suitable for 35~50mm door thickess, can add 100 card users. RFID card / key to unlock. World famous Philip chip to make sure the lock stable, reliable, and safety