Fangrui Product Details 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 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 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/g Wireless Range: 45m Working Temperature: 0c~60c (32f~104f) Free App: Tuyasmart Or Smart Life. Support System: Android And Ios. Works With And Home Colour:white Material:plasti