Liftmaster now has a brand new technology, My Q is the latest and greatest in garage door openers. It gives you the ability to open or close your garage door opener from anywhere in the world. All from your smart phone or computer. No more guesswork on did you remember to close it. No more giving out a code access to your opener. Someone needs in? You now have the control. This new technology comes in chain or belt drive and also automatically comes with battery backup. You will not regret the decision in purchasing this unit.