The Aeotec by Aeon Labs recessed door sensor is a battery powered, Z-Wave powered, magnetic door sensor with an extremely small form factor. Unlike existing Z-Wave door/window sensors, the recessed door sensor offers a unique, invisible installation – it’s easily installed within a doorframe meaning it avoids altering a room’s aesthetics without ever compromising on functionality. The recessed door sensor can send Z-Wave signals to up to 5 associated devices within its own network, and does so simply when the door it’s installed within open or closes. The Aeon labs door sensor also has low-battery alerts and offers a simple method of replacing the battery.
– See more at: http://aeotec.com/hidden-z-wave-door-sensor