The Bosch Smart Home Smoke Detector will detect fire and smoke and will notify you directly via the Bosch Smart Home App. The alarm siren can also be silenced remotely via the Bosch Smart Home App. In the case of smoke detection, an integrated emergency light will activate. This product requires the Bosch Smart Home Controller to work. If more than one Bosch Smart Home Smoke detector has been installed, all of the detectors will sound if an alarm is activated. The App will notify you in which room the alarm has been detected. When combined with a Bosch Smart Home Door/ Window contact or a Bosch Smart Home motion detector, the siren will sound in case of intruder detection. Hush button operation. Test button operation. 10 year sensor life. Batteries required: 1 x Li-Ion (included) . Size H5.1, W11.9, D11.9cm. Manufacturers 2 year guarantee.