Material : ABS Size: 70*24*19mm Product Weight: 30g Battery:LR03-1.5V/AAA*2 Wi-Fi frequency: 2.4GHZ IEEE 802.11 b/g/n Temperature Measure Range: -20°C ~ 60°C Humidity Measure Range: 0% RH ~ 100%RH Temperature Measure Accuracy: ±1°C Humidity Measure Accuracy: ±5%RH Specifications: 【Intelligent Linkage】   When the ambient environment change, you can do intelligent linkage. For example, the air conditioner will be on and turn to specified temperature automatically when the room temperature surpass 28℃. And the humidifier will spray when the humidity is lower than 20% RH.   【Share devices】   You can share your added devices with your family members, so they can also monitor the ambient environment.   【Temperature Unit Selection in APP】   You can choose ℃ or ℉ as the temperature unit through app.   【 Third-party Voice Control】   Works with amazon alexa, google assistant.   【Low battery alarm】 The battery level can be monitored.   【Temperature and humidity changes.】 Temperature and humidity change curve, historical data.   【Wall-mounted, easy to install】   Package Included: 1*Sensor 1*Instruction 1*Back sticker