You'll never need to worry about losing another garage door opener once you've installed Linear Corporation's Digital Keypad. Part of Linear's MegaCode series of wireless radio controls, this Digital Keypad uses a radio format to provide security with over a million different codes. Programming your PIN number is easy, and then you need simply to enter your unique code on the keypad to activate your garage door opener or gate operator. These are not universal remotes that work with existing garage door openers - a MegaCode receiver MUST be purchased and used with them. What's Included # MegaCode Wireless Keypad # 2 screws and anchors for wall mounting # 1 9 volt battery