Val Mart deals in a variety of devices meant to aide in your doors' operation:

receiver  Radio Controls—an entry device that allows for the wireless operation of your door. Multiple transmitters can be used with the same door.
programmable receiver  Programmable Radio Controls—-an entry device which allows you to delete lost or stolen transmitters. System can be designed to monitor who is entering or exiting through the door.
  Long Range Radio Controls—-an entry device that gives you the ability to operate your door from further away. Keeps you from waiting, open the door before you get there.
  Treadle Hose Entry/Exit System—-Treadle hose systems can be used as entry or exit devices. With this device the door can be made either to open or close when a vehicle drives over the hose.
  Loop Detector Entry/Exit/Safety System—-in-ground loops can be used as an entry or exit device or, when placed under the door, as a safety device that prevents the door from closing when a vehicle stops on top of it.
  Proximity Readers—-an entry device which requires a card to be passed in front of a sensor to open the door. Lost or stolen cards may be deleted from the system. System can be designed to monitor who is entering or exiting the door.
  Push Button Units—-keyed or unkeyed, these entry/exit devices allow you to open, close, and stop your door quickly and easily.
  Pull Chord Switches—-entry or exit device that can be hung from the ceiling so forklift drivers can activate door without leaving the forklift.
  7 Day Timers—-set a different door open and close time for each day of the week.
  Key Switches—-an entry or exit device that requires a key to operate.
  Card Readers—-an entry device which requires a card to be inserted to open the door. Lost or stolen cards may be deleted from the system. System can be designed to monitor who is entering or exiting the door.
  Motion Detectors—-an entry or exit device that will open the door when motion is detected.