The ACSR-AQ900 is an Outdoor or Indoor Proximity Card or Keypad Reader. This reader works by itself with no control panel or computer needed. You can control all your door locks, alarms and contacts from behind the reader. Made of Vandal Proof Zinc Alloy makes this reader a perfect choice for an outside door or inside door. This indoor/outdoor reader requires a AQ Proximity Cards or AQ Keyfobs for card access. You can also have users require both pin and card for entry. You can always use traditional methods and program this device to only accept a 4 digit pin code or simply swipe the proximity card. Powering this reader is as easy as connecting a 12v DC power supply.