The SmartguardAir is powered by two AA batteries which provide up to 2 years of battery life when operated 300 times a day. A very useful feature in both versions is the backup memory chip which allows you to record all the programmed access codes. You can then remove the chip and use it to program other keypads on the same site. The Smartguard Stand-Alone Keypad  includes the following features: Up to 1000 unique 1 to 10 digit codes for greater security and versatility in a multi-user application  (up to 10 billion permutations). Selectively add and delete user codes – easy administration of multi-user system. Memory backup facility – guarantees data security. Multiple outputs for improved functionality. Anti-hack feature – prevents access through vandalism. Various alarm conditions including duress and panic – increase situational safety. The programmable down counter allows a limited number of entries. Elegant sturdy construction – for greater durability. Weatherproof – suitable for both interior and exterior use. Backlit keypad with audible feedback – improved usability in dark conditions. Optional anti-tamper switch – provides warning of physical tampering. Optional anti-knock shield manufactured from brushed 304 stainless steel – provides greater resistance against vandalism.   For more information download our product datasheet. SMARTGUARD STAND ALONE KEYPAD DATASHEET