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Ademco Honeywell 5816 Door and Window Transmitter 5816 Wireless Two-zone Transmitter. Features a built-in reed switch and tamper. Two zone transmitter with both built-in magnetic reed switches and wired closed circuit contact loop. The 5816 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 installations. With a demonstrated outdoor range of over a mile, the 5816 has the best performance of any transmitters available today. Dimensions: 3-1/16”H x 1-9/16”W x 1-3/16”D