Free up that ceiling space for a lift or additional storage. Wall-mount installation - mounts on the left or right side of door. No rails to hang, it simply mounts on the wall and attaches to the garage door torsion bar. Unit requires an electrical outlet within 6 feet. Patented absolute positioning technology - the newest technology in garage door openers. Liftmaster patented design allows the electronic limits to be extremely accurate, even after a power failure. OPTIONAL ACCESSORIES 990LM Surge Protector - Safely protects the entire garage door opener system,including the AC power line, control panel and the Protector System Safety Sensors. 377LM Keyless Entry - Never have to worry about keys to the house. This is an ideal way for kids to enter the home without the need for carrying a house key or a friend who want to get into your garage. 395LM Remote Light Control - No more walking into a dark house. As your driving up to your home open the garage door and turn on a light (or holiday lights) with your garage door remote control. 975LM Laser Parking Assist - Designed to help you park in the right spot, everytime. 580LM Alternate power Source - Makes installing the model 3800 Residential Jackshaft Opener easier when an outlet is not available within 6 feet. Puts power right where you need it. 475LM Battery Backup - Each year 93% of homeowners experience a power loss. And one of the many inconveniences they face is a garage door that won't open. 915LM Garage Door Monitor - Ever wonder if your garage door is open? Garage Monitor gives you peace of mind knowing if your garage door is open or closed from any room in the house.