Linear Stanley Compatible Visor Transmitters, 2-Channel (MCS109410) by Stanley -Compatible with 310 MHz Stanley, Multi-Code, and Digi Code receivers Includes visor clip, battery, and programming manual --- Powered by 9-volt battery Linear Part Number MCS109410 --- 1,024 codes per channel Easy access to battery and coding switches ---- RF frequency: 310 MHz Dimensions: 3.75" W x 2.5" H x 0.875" D