Sensor 2’s ultra-slim 14 mm profile allows discreet installation on door frames without visible cabling; the magnetic reed switch and housing are fully concealed. An auxiliary input accepts an external contact such as a flood sensor, pressure mat, or garage loop for multipurpose triggering. On-board temperature sensor provides room-level climate data as a bonus. Colour-coded LED indicator gives a visual status on the device during pairing and alarm conditions. Two-year battery life on a single CR14250 cell and tamper protection alert upon case opening.