The Keystone Heddolf O220-1K-340 garage door opener remote control from Garage Door Supply Company is a 340MHz remote with one button to control one garage door. This remote has nine dip switches, making it compatible with older Overhead Door 340MHz garage door remotes and receivers with nine dip switches. These older models include the Overhead Door model 109130-3401 remote, and any Overhead Door or Crusader 340MHz receiver. A visor clip, programming instructions and battery are included with your transmitter. The small size (3 in. x 1 3/4 in. x 1/2 in.) makes it easy to attach to your car's visor, or carry it in your pocket. Product Highlights: