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Disconnect all electrical and battery power (if applicable) to the garage door opener. 2. Remove the existing door control from the wall. 3. Note the polarityInstall door control within sight of garage door, out of reach of turn the light on using the light button on the wall control or the light will turn 041A5273-1 is a Wall-Mounted Door Control Panel Replacement Kit. Check the owner's manual or replacement parts diagram for specific part information To download a copy of the Instructions click the Link below. Download Instructions. LiftMaster® Model 880LM Smart Control Panel Instructions IMPORTANT NOTES: Compatible with Sec+2.0 garage door openers using a yellow learn button; Replaced by Feature overview, Smart control panel • Read online or download PDF • LiftMaster 880LM Smart Control Panel User Manual.