The NX450 Can be used on most any door, window or anything else you need to detect an opening on. Also features outboard contact inputs for using an external switch, terminal block is required however and is not included with the transmitter.
This transmitter measures approximately 4.25" long by 1.13" wide and is .88" deep. Includes a magnet and AAA batteries. Battery life is approximately 4 to 6 years under normal use.