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 features an advanced optical sensor utilizing Thermoptek technology, which enables early detection of fire sources through the combination of an optical sensor and a heat sensor. With the Sleep-Easy function, you can silence the final 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 visual signals. Its easy installation and compact size make this sensor suitable for both residential homes and any areas 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 that allows you 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.