EZVIZ Smart Smoke Sensor T4C detector designed to enhance the safety of your home or business premises. It quickly detects the presence of smoke and sends alerts directly to your mobile device. It is intended for anyone who wants to provide additional security to their home or business, and is particularly useful for families with children and businesses where there is a high risk of fire. 360-Degree Smoke Detection, Loud Siren (85dB) & Strobe Light Alarm, Dual-photoelectric Smoke Sensing Technology, Instant Alerts via EZVIZ App, Compact & Light Design, DC 3V, Lithium Battery.