When the smoke sensor detects a hazard, it starts an alert scene and immediately notifies you on your mobile device. No matter where you are, you're in control. The smoke detector in your home is a guard, watching your clock around you, every day. COMPACT DESIGN: Much smaller than traditional smoke detectors, the CPVAN FSD001 Miniature Smoke Detector features a modern, compact design for discreet wall or ceiling mounting. This siren is great for adding protection to your home and still uses a loud 85 decibel siren when smoke is detected. EASY TO INSTALL: The CPVAN WIFI Smoke Detector connects easily to your Wi-Fi without a hub. Just install a wireless smart smoke alarm on the ceiling, download the app, and protect your home from fire. simple. Specifications: Detector Power Supply: 1 x 3V CR2 Lithium Battery; Wi-Fi Basic Power Supply: 2 x 3V CR2 Lithium Battery; Operating Voltage: DC3V; Low Voltage Threshold: 2.7V; Alarm Sound: >85dB; Alarm Mode: LED & Buzzer & APP Alarm; Battery Life: 3 Years; Wi-Fi Standard: 2.4GHz 802.11b/g/n only.