Skylink KN-318 Keyless Entry System Operates up to four Skylink Garage Door Openers, compatible with all Skylink Garage Door Openers The Keyless Entry System is a wireless system - no wiring required Easy installation with a two-step programming procedure and operated by one low cost AAA Alkaline Battery Keypad will automatically lock for 10 minutes after ten incorrect passcode attempts. The back-Lit keypad makes it easy to see the numbers, even in the dark. NON-UNIVERSAL. Requires Skylink GB-318 Smart Button Receiver to work (Sold Separately) When combined with the GB-318 Receiver, this keypad becomes universal to work with most national brand garage door openers.