The Heiman Matter smoke detector has accurate smoke detection and alerts you acoustically and visually. In a serious situation, the smoke sensor flashes a red LED and emits a loud alarm. You also have the option of receiving a warning on your smartphone if you are not at home. This prevents smoke from starting a fire and causing expensive consequential damage. By using Matter over Thread wireless technology, the sensor can be connected to any Matter-enabled controller. Detects smoke and visible particles caused by a smouldering fire. Notification of fire alarm, even when travelling. Alarm volume: 85 dB/3 m. Battery level indicator. Battery required: Yes (1x CR123A battery). Radio technology: Matter over Thread. Smoke detector complies with DIN EN14604 standard. Operating temperature: -10 to 50 °C.