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The Transmitter Soulutions- Firefly3 Transmitter is a very small (1-1/2 x 2-1/8 x 3/8 ) key chain style wireless transmitter operating at 318 MHz. The firefly achieves its small size by using state-of-the-art, surface mount compoents. It has been designed for use with and is compatble with all dip switch receivers operating at a 318 frequency, including all Allstar Model 9931 and Heddolf P220 9-dip switch digital receivers.