When the smoke sensor detects a hazard, it initiates an alarm scene and notifies you immediately on your mobile device. No matter where you are, everything is under your control. The smoke detector in your home is a watchman, watching the clocks around you every day. Compact Design: Miniature Smoke Detectors are much smaller than traditional smoke detectors and feature a modern, compact design for discreet wall or ceiling mounting. This siren is great for adding protection to your home and still sounds a loud 85 decibel siren when smoke is detected. Easy to Install: The smoke detector easily connects to your Wi-Fi without a hub. Simply install a wireless smart smoke alarm on your ceiling, download the app, and protect your home from fire. simple. Due to differences in light exposure or computer display, I cannot guarantee that the color of the photo and the real object are 100% the same. Hope you can understand.