Carper 318T trinary 3 position + 0 - dip switch keychain remote Features and Specifications (Trinary Model) 3 positions + 0 - or up, middle, & down settings on each of the 9 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 9931 (trinary, 3 positions per dip switch), 318 Mhz frequency