LiftMaster OEM Factory Direct, 377 lm (377LM) Description Compatible with 315 MHz lift master security+ garage door openers with a purple learn button under the light cover of the motor head and chamberlain radio control receivers only on 315 MHz Features: Security + rolling code technology assures a new code is sent every time the keypad is used Temporary password option enables friends or service people to enter the garage without giving them Completely wireless - powered by one 9-volt battery (included), weatherproof flip-up protective cover Works only on 315 MHz frequency and they must have a purple learn button on motor head Backlit keypad makes numbers easy to see, even in the dark, one-button-to-close feature makes it easy Product Details: Manufacturer: ‎Liftmaster Part Number: ‎377LM Item Weight: ‎2.08 ounces Product Dimensions: ‎10 x 4 x 1 inches Item model number: ‎377LM Batteries: ‎1 9V batteries required. (included) Is Discontinued By Manufacturer: ‎No Item Package Quantity: ‎1 Number Of Pieces: ‎1 Batteries Included?: ‎Yes Batteries Required?: ‎No Battery Cell Type: ‎Alkaline Date First Available: April 18, 2014