What are the dimensions of a Honeywell 5811?

The Honeywell 5811 includes a very small magnet enclosed in a white plastic case. The plastic case dimensions are 15/16 inches long, 7/16 inches wide and 5/16 inches high. If the case is too big for your door or window, you can remove the raw magnet from the case and use a bonding agent to mount the magnet directly to the door or window. The actual magnet dimensions are 3/4 inches long, 1/4 inches wide and 3/16 inches high.

The 5811 is the nicest looking wireless door and window sensor of any of the 5800 Series wireless devices as it has a very flat profile that blends very nicely with your home's decor. It also has a greater wireless range than some of the other smaller Honeywell wireless door and window sensors so you can mount it further from your Honeywell wireless security system without having RF supervision problems.