Sensorblue Hygrometer Sensor Bluetooth Humidity(pack of 2)

Easy to use!
Connect with free Smartphone App via Bluetooth - up to 50m range
Low - and High temperature alarm settings. 
Temperature in °C or °F 
Smart Bluetooth app, can connect up to 100 loggers at the same time. 
It can be used for about 1 year with CR2477 battery (included). Battery is replacable
Data Storage Export. Can store up to 100 days of data. Data on the APP shows red when data is beyond preset range.