The device is a single door wireless access control, consists of a wireless & waterproof keypad, a mini controller, and a wireless exit button. 433MHz rolling code of encryption algorithm and the split design guarantees higher-secure. The keypad can store 600 PIN/card users, including 500 common users and 100 visitors' users. PIN length can be 4~8 digits, with internal & external alarm, door contact, exit button (wired) and doorbell. Because of ultra-low power consumption, the keypad and exit button can work as long as one year (bases on 20 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.