The Skylink garage door closer automatically closes door when user forgets, with help of settable timer. Recommended Use: Door closer, Mount Type: Wall, Dimensions L x W x H (in.): 7 x 6 3/4 x 1 3/4, Power Supply: AC, Bulb Type: LED, Compatible With: Garage door, Senses: Motion/security, Single, Pair, or System: Pair