Disconnect Electrical power: Prior to working on your garage door opener, disconnect the facility for the breaker or unplug the unit to stop accidental operation and reduce the risk of injury or electrical shock. One of several standout features with the Chamberlain Whisper Drive 1/two Hp Belt Drive Garage Door https://youtu.be/wSkWTAdm-Gg?si=pR5EXdjVuNYjtHN7