Smoke Detector (ST-622) Description: The ST-622 model is a high-quality smoke detector from the English company FireAngel. This brand is part of the Sprue Group, a leading global manufacturer of smoke and carbon monoxide detectors. The device is equipped with an advanced optical sensor using Thermoptek technology, which allows for early detection of fire sources by combining an optical sensor with a heat sensor. With the Sleep-Easy function, you can mute the end alarm for 8 hours to facilitate replacement with a new unit. With the FireAngel ST-622 smoke detector, we can be assured of safety due to its strong acoustic and optical signals. Its easy installation and compact size make this sensor suitable for both residential homes and any rooms where protection from fire sources is recommended. Features: Optical smoke sensor with advanced Thermoptek technology. Built-in lithium battery that does not need to be replaced for 10 years. Sleep-Easy function to mute the alarm after the device has completed its operation. An 85 dB sound signal is emitted within a 3 m radius. Sensor test/reset function. Automatic sensor and battery test function. Certified to the quality standard BS EN 14604:2005. 10-year warranty. Specifications: Alarm temperature: 4 to 38 °C. Humidity range: 0 to 93%. Sensor: optical. Device diameter: 130 mm. Weight: 162 g.