Bluetooth Wireless Connectivity: The wireless temperature sensor uses a high-end Bluetooth 5.0 chip. monitor temperature and humidity data on CozyTime App via Bluetooth. Detecting range is up to 30m (98ft) without obstructions.Free Data Storage And Export: Store a set of data in 5 minutes intervals, support up to 100 days data storage. One smart device can be connected up to unlimited number of temperature sensors simultaneously.High Accurate Monitor: Temp. range: -20~80(-4~176) , Humidity range: 0-99%RH. Up to 1s responsive speed always shows you the latest readings.Smart Alert Function: Set preset temp and humidity ranges, and receive an app alert immediately whenever levels fall out of that range, which helps you react faster to sudden changes in your greenhouse.Pocket-sized Design: With a compact and design. Perfect for monitoring home, pets, refrigerators,zers, walk-in cooler, wine cellars, etc. CR2032 battery lifespan is about 1 year and can be replaced by yourself.Wireless Range: 30m (98ft)Humidity Range: 0-100%RHHumidity Accuracy: 3%RHTemp. Range: -20~80C/-4~140Temp. Accuracy: 0.3C/0.54Battery Model: CR2032Historical Data: 100 daysSmart Alarm: YESMagnetic Back: YesMaterial: plasticcolour: C-White + GreenPackage Contents: 2 x Temperature Sensor CT011 x CR2032 batteries1 x English instructions