Carper 318Mhz 9 dip switch binary keychain remote Features and Specifications (Binary model) 2 position only, up and down or + - on the dip switches Mini garage door opener remote with built-in flashlight, key ring and 12V battery included Mini ""key chain"" size (2"" by 1"") Key chain and convenient surface mount kit included Compatible with all Allister, Pulsar or Allstar garage door opener systems, model 9921 or 8822 (BINARY, 2 position dip switch), 318 Mhz frequency