The B970 is an ultra quiet super strong and durable steel-reinforced belt drive garage door opener engineered with smart technology to help you manage activities and simplify your life. Built to withstand extreme conditions its constructed with anti-vibration technology and precision engineered for years of reliability and smooth performanceperfect for attached garages. Powered by Chamberlains Lift Power System it delivers the maximum lifting capacity in the category. Built-in Wi-Fi and the MyQ App allow you to get real-time alerts open close and know the status of your garage doorfrom anywhere. Designed and engineered for safety and security the B970 includes a full-function wall control panel a wireless keypad and features enhanced Triband technology for superior range performance and less interference. Battery backup keeps the unit working even when the power is out. Accepts two 100-wmax non-halogen or 26-wmax CFL light bulbs not included. Designed specifically for 7 ft. garage doors - extension kits required for 8 ft. and 10 ft. doors. Exclusive Triband technology boosts remote range up to 1500 feet for a quicker entrance and exit Item Dimensions: 18" L x 10" W x 6. 5" H.