- The Honeywell Ademco 5800 MICRA magnetic contact and wireless transmitter is so small, it is virtually invisible when installed. Great solution for providing concealed protection for tight spaces like vinyl windows. Ability to shallow-recess the contact while keeping the exterior integrity of the vinyl window. The Honeywell Ademco 5800Micra recessed transmitter uses a reed switch magnet contact transmitter providing concealed protection for windows. Features include the cleanest, fastest installations, a battery life of up to 10 years and exceptional range, you'll want to use it on every job where aesthetics and discretion are critical.