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Read instructions thoroughly BEFORE beginning. Start with Mount the keypad out of the path of the moving garage door, but within sight of it. (4" (10 cm) Download Manual. Articles. Go Back. Keyless Entry 877LM Owner's Manual. Download Manual. Go Back. Feedback. Was this information helpful? Yes No 19 Jun 2014 5 May 2012 KPW250 - The frequency and encryption are set at the factory for LiftMaster The Wireless Commercial Keypad must be put into programming mode prior to any Garage Door Keypads LIFTMASTER AND SEARS CRAFTSMAN WIRELESS KEYPADS 976LM, 377LM Security Plus and 66LM Wireless Keyless Entry Systems.Refer to your product owner's manual for additional programming instructions if necessary. The keypad will blink four times when the one button close. 11 Oct 2017 Looking to add, change or program your LiftMaster garage door opener PIN? Check out our list of simple steps to programming your keyless entry pin! lights will blink to indicate the keypad PIN has been successfully set. 3 Mar 2016 To program the Liftmaster 387LM Universal Wireless Keypad you will first need to determine what brand garage door opener you have and if 17 Oct 2017 Liftmaster Wireless Keyless Entry 377LM (315 Mhz) Instructions. To buy a new 377LM keypad visit this page - Liftmaster 377LM Keypad.