Simply replace or parallel your existing wall button with Skylink smart button receiver with easy clip - model #MK-1 universal key chain garage door remote Control kit. The smart button included in this package receives a signal from the remote control and opens/closes your garage door. The easy clip for the smart button receiver makes this connection a simple one-step installation. No AC outlet required, just clip the easy clip to your existing control wire and press the button on your Skylink remote control. The #MK-1 kit is universal and compatible with all national brand garage door openers. You can operate up to three garage door openers with the same remote control. Add additional smart button #GB-318 receivers to operate multiple garage doors or add additional remote controls such as MK-318, MK-318-1, MK-318-2. Skylink's three-button remote is also equipped with optional password protection as an advanced security feature. Prevent break-ins to cars and homes by adding a password to your key chain remote control. Includes a long life battery and a 1 year warranty. Now you can add the convenience of a small key chain garage door remote control to almost any garage door opener.