The Chamberlain MyQ Advanced Garage Door Monitor is a convenient remote control for your garage door that lets you know when the door has been left open, and close the door by pressing the "Close Door" button. It works with any Chamberlain MyQ-enabled Garage Door Opener and simply plugs into a power outlet. Place it on a kitchen counter, your bedside table, or anywhere else in your home for greater peace of mind. FEATURES: Works with up to four MyQ-enabled garage door openers. Beeps and illuminates red LED when the garage door is open. "Close Door" button to remotely closes the door. Beeps and illuminates green LED to confirm when door has closed. Adjustable volume for audible beep alerts. Easy setup - plugs into a standard 110VAC outlet. CONTENTS: Garage Door Monitor; Power Adapter, 9 VDC; User Guide. NOTE: Requires a Chamberlain MyQ-enabled Garage Door Opener, sold separately.