Features Temperature Humidity Sensor: The sensor can monitor the temperature and humidity in real time. You can view the subtle changes of temperature and humidity on the LCD and APP. Push Notifications: When the indoor temperature and humidity are higher or lower than the normal value, the sensor will send a push message to remind you through the application. Wide Compatibility: The sensor can be used with a variety of smart assistants. You can let your smart home run automated processes through them. Measurement Ranges: Comes with a wide measurement range of -10℃ ~ 50℃ and 0% - 99%RH, the thermometer also has high accuracy in testing. A Practical Sensor: Use this humidity sensor in your bedroom, living room, office, and so on, which will help building a more comfortable environment. Specification:Item Type: Temperature Sensor Wireless Protocol: For Bluetooth 4.2 Product Voltage: DC 2.5V-3V Temperature Measurement Range: -10℃ ~ 50℃ Humidity Measurement Range: 0% - 99%RH Power supply: CR2032 button battery 50mah, shipped with built in battery.  Package List:1 x Temperature Sensor 1 x User Manual Package List 1 x Temperature Sensor 1 x User Manual