Abstract: A hazardous condition detection device includes a small and lightweight main body having connectors along one side for securement to a building wall or ceiling. A detection unit is positioned within the main body and includes sensors such as a smoke detection sensor, a heat detection sensor, a carbon monoxide sensor, a radon detection sensor, a natural gas detection sensor, and/or a propane detection sensor. An alarm unit is positioned within the main body for generating an audiovisual alarm indication. A controller having a wireless interface is positioned within the main body and communicates with an externally located processor enabled device.