Welcome to the shop! Early Warning of Unexpected Fires: This TÜV-tested smoke detector utilizes a photoelectric sensor for rapid response to smoldering fires. It emits a loud, piercing alarm exceeding 85 dB, helping you detect fires early, escape safely, and minimize property loss – a vital safeguard for life and property. Requires 2.4 GHz WiFi for app connectivity. Indoor Use: Perfect for bedrooms, living rooms, hallways, etc. The LED indicator blinks every minute to confirm functionality, with a faint green light that won't disturb your sleep. Attractive, ultra-thin design; diameter: 120 mm, height: 31.5 mm. The small size is unobtrusive on your ceiling. Quiet Mode: When the smoke detector detects smoke and the alarm sounds, you can silence it for 10 minutes by pressing the power button (in the center of the cover). The detector will resume normal operation after 10 minutes. Long Lifespan: Equipped with a 10-year (non-replaceable) lithium battery. No more hassle of changing batteries. Easy Installation: Screw sets and double-sided tape are included. Choose the best installation method based on your location. We recommend screw installation for a secure fit. Watch the video and read the user manual carefully upon receiving the smoke detector. This will help ensure proper and easy use. Note: Dimensions are manual measurements, allowing for 1-14 cm error. Due to differences in lighting and screens, there may be slight color variations. The actual product may differ slightly. Your satisfaction is our top priority. We will provide you with the best service. If you encounter any problems after receiving the product, such as damage, incorrect quantity, etc., please contact us immediately, and we will provide the best solution!