This product is a photoelectric smoke detector. The circuit uses a photoelectric smoke sensor to monitor the fire situation. The main control chip uses a professional analog-to-digital conversion input port to intelligently judge the sensor signal; The unique photoelectric signal feature processing and professional design are adopted in the structure, so the product has the functional characteristics of stability, dust-proof, insect-proof and anti-external light interference. The product adopts NB-IoT signal transmission, which can transmit the alarm data to the cloud platform in real time and push it to the mobile phone. It supports SMS, telephone and small program alarm. It uses a special lithium battery for the Internet of Things, which has ultra-low power consumption and can stand by for 3 years. Products are widely used in residential, shopping malls, hotels, restaurants, office buildings, teaching buildings, and warehouses, such as indoor smoke monitoring.