The KDH-KAB200U-IVORY/BLACK is a single door wireless access control, consists of a wireless keypad, a mini controller and a wireless exit button. TEA + Rolling Code of encryption algorithm and the split design guarantees higher- secure. The keypad can store 500 PIN / card users. Because of ultra low power consumption, the keypad and the exit button can work as long as one year (bases on 30 times/day), with just 3 units of AAA batteries and 1 unit Li-battery. It will remind people to replace batteries intelligently if low battery.