3-button visor remote for garage door openers operating at 390 MHz. Controls up to three single-channel receivers or one 423LM 3-channel receiver. Features red LED battery indicator, color-coded buttons for quick identification, and includes visor clip for easy mounting. 9-trinary DIP switches provide 19,683 code combinations for security. Dimensions: 3.5 x 1.6 x 0.6 inches. Compatible with model 33LM openers. Not compatible with models ending in "C" (315 MHz Canadian versions). Also replaces Craftsman 139.53778 and HBW1D3469 remotes originally supplied with Craftsman 139.53778, Craftsman HBW1D3469, and Liftmaster 33LM openers.