Our wireless smoke detector is an optical detector that communicates wirelessly with the gateway. This makes it very easy to mount since you don’t need too stretch any signal cables. The detector will notify you locally with a high pitch buzzer as well as send you a notification in the Sikom Living app. If one detector goes off, they all go off. Our wireless fire detector has connection for both 230V and 9 volt battery. We recommend that batteries are changed at least once a year since the detector should primarily save lives in case of a fire.