【Siren with Temperature and Humidity Sensor 3IN1】APP sets the temperature and humidity alarm range in advance, detects changes in ambient temperature and humidity, exceeds the safety interval, and automatically alarms even in the absence of a network. 【100dB Loud Alarm & 18 Alarm Ringtones】When the siren alarm triggered, it will make alarm with both 100dB voice prompts and quick flash strobe. 18 alarm sound ringtones optional, with colorful life. 【2.4GHz WiFi One-key Connect Easy Setup】Don't need home gateway, you can easily achieve the intelligent control of home appliances, simple operation, easy to use. 【Dual Power Supply & Linkage Function】Powered by the included USB cable or back-up battery (not included). Helps keep your home safe even if the electricity fails. It can linkage with other smart home products, such as PIR sensors or door sensors, etc. 【APP Remote Control & Voice Control】No matter how far away from home, the warmth of home is in hands. Making your home smarter. Compatible with Amazon Alexa and for Google Home IFTTT for voice control. Specifications: Power Supply: Mini USB, DC5V/1A Backup Power Supply: 2*CR123A(not included) Sound intensity: 100dB Wireless Standard: WIFI 2.4G 802.11 b/g/n Wireless Range: 45M Control Mode: Mobile APP "Tuya/SmartLife" App Support: Android/iOS Operating Temperature: 0°C ~ 40°C(32°F ~ 104°F) Operating Humidity: 20% ~ 85%RH Item Size: Approx. 6.8 * 6.8 * 3.4cm (L*W*H) Item Weight: Approx. 65g / 2.3oz Package Information: Package Size: Approach. 9.7*8.7*5.2cm/3.8*3.43*2.05in Package Weight: Approach. 114g / 4oz Package List: 1 * Wireless Siren Alarm 1 * USB Cable 1 * User Manual (English) 1 * Set of Mounting Screws 1 * Sticker