Product features: Please make sure your garage door opener has a red/orange/purple/yellow/green learn button! Compatible brands:Chamberlain, Lift Master, Craftsman Applicable model:891LM?893LM?890Max?893Max?971LM?973LM?371LM?373LM?81LM?83LM series yellow red orange green purple learning-button garage remote control Frequency:310MHz,315MHz,390MHz Battery Type: CR2032?pre-installed? Channels:2(Equipped with 2 buttons to control two garage doors) Radio Codering:Billion code,Security+,Security+2.0 Package List: 2*garage door remote control 1*operation instruction