Honeywell Ademco 5816WMBR Brown Door / Window Transmitter w/ Magnet Dimensions: 3-1/16" H x 1-9/16" W x 1-3/16" D Two zone transmitter with both built-in magnetic reed switches and wired closed circuit contact loop. The 5800 Series of door and window transmitters provide the most reliable, convenient and cost effective solutions for security protection. These devices are powerful and versatile enough to help solve even the toughest, most labor intensive installa With a demonstrated outdoor range of over a mile, the 5800 Series has the best performance of any transmitters available today.