A wireless sensor assembly includes a wall plate that is configured to be secured to a wall of a building using either a threaded fastener or a releasable adhesive strip, the wall plate including an aperture therethrough for accommodating the threaded fastener and a recess on a back surface of the wall plate to accommodate at least part of the releasable adhesive strip. The wireless sensor assembly includes a sensor housing including a front housing region and a back housing region, the back housing region configured to be releasably secured to the wall plate, the back housing region including a recess that is configured to receive at least part of the wall plate when the back housing region is releasably secured to the wall plate.