The LiftMaster 8355 Premium Series 1/2 HP AC Belt Drive MyQ Security+ 2.0 (Replaces 3280 NO RAIL ASSEMBLY) is easy to install and will have your garage door running smoothly. This powerful garage door opener allows you to control up to three garage doors, gate operators or MyQ Light Accessories. This energy efficient system also comes with the Protector System® which has safety sensors that project a light beam across the garage door opening and reverses automatically if something obstructs it. Opener light turns on automatically when The Protector System® safety infrared beam is broken. The patented PosiLock® system ensures the door remains securely locked when it is closed. The Security+ 2.0™ keeps you safe with every click a new code is sent to the garage door opener so that the door only opens for you. Connectivity Free MyQ® Mobile App so users know their home is secure. Built-In Wi-Fi® for the easiest way to connect the garage. Real-Time Alerts indicate the status of the garage door via email or push notifications. Monitors and Controls the opener from anywhere using mobile devices. Performance P3 Motors™are specifically built for use in Garage Door Openers providing reliable, durable, and powerful performance. 1/2 HP AC Motor is purposefully designed and built to last. Belt Drive system for quiet, maintenance-free performance. Motor Vibration Isolation System (MVIS®) provides quiet, reliable operation. Safety and Security Security+ 2.0® safeguards garage access with every click, a new code is sent to the Garage Door Opener, ensuring the door does not inadvertently open. PosiLock® electronically protects against forced openings. Alert-2-Close signals when a door is being closed by MyQ®. Motion Detector activates the Garage Door Opener’s lights upon ⁰ entry. The Protector System® invisible light beam auto-reverses the door if there is an obstruction.