The MegaCode MDR/U Single Channel Plug-in Receiver is a versatile (universal) receiver that makes it very easy to equip nearly any garage door operator for use with Linears popular MegaCode format remotes. MegaCode uses a frequency of 318 MHz and features over one million radio codes to all but eliminate any possibility of code duplication. Makes any garage door operator compatible with MegaCode remotes, simple plug-in design, easy to install - one connection using two-conductor wire, learn mode with 10-remote capacity, normally open contact activates for 0.5 seconds. Power: 110 VAC +/- 10%, 60 Hz. RF frequency: 318 MHz. Dimensions: 2.52" W x 2.5" H x 1.61" D. Warranty: 1-year.