The model LiftMaster 8550W door operator is manufactured by Chamberlain Group. Its most important feature: it will operate the garage door for 20 cycles within a 24-hour period, and recharges automatically when the power comes back on. An audible signal tells you when the power is out and the EverCharge® Standby Power System is in use. Meets all UL325 requirements.

• Works with MyQ; core features that allow you to control your garage door from anywhere, get activity alerts and set schedules are included with the MyQ app.
• MyQ Technology now with Wi-Fi®, lets users receive alerts and open and close the garage door from anywhere.
• P3™ Motors provide proven reliability and durability.
• DC Motor Belt System delivers powerful, ultra-quiet performance.
• Battery Backup ensures access to your garage when the power goes out.
• Dependable warranty includes lifetime coverage of motor and belt, five (5) years on parts and one (1) year on battery.
• Automatic Garage Door Lock Capable (2 max.)
• Motion Detector is integrated into control panel providing rapid detection and illumination of garage.