1. Temperature Humidity Alarm: This sensor can be used to detect room temperature and humidity, and the results can be viewed through the mobile APP. 2. 2.4Ghz WiFi: This temperature detector supports 2.4Ghz WiFi connection and can be powered by 2 CR123A button batteries (not included). 3. Security System: You can connect this alarm to your router, gate way, phone and other electronic devices. 4. Memory Function: This can retain the previous settings, and it will be restored automatically when the power is turned on again. 5. Wide Application: This wireless automation device is suitable for home, office, hotel, bar and other places, it will remind you with a loud sound. Model Number: Temperature Sensor Product Name: WiFi USB Siren Power supply: mini USB, 5V-1A Sound intensity: 90dB Wireless type: 2.4GHz, 1T1R Protocol: IEEE 802.11b or g Wireless range: 45m Working temperature: 0C-60C (32F-104F) Free app: Tuyasmart or Smart Life. Support system: Android and IOS. Works with Alexa and Home Colour:White Material:plastic Package Contents: 1 x Sound and Light Alarm 1 x Screw Pack 1 x USB Cable 1 x English Manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.