Display nearby T-Sensor values, such as Temperature, Humidity, Air-Pressure, Altitude. The app will keep bluetooth connection with device all the time to get instant sensor data. You can change your device avatar by taking photo. Sensor data are store in app, you can export excel file to share with other devices.JW1407PTA measures Temperature (0~70℃), Air Pressure, Altitude.JW1407HT measures Temperature (-40~70℃), Humidity.Since the bluetooth permission belongs to location permission, so app require background location access, but we announce that we never collect users location data.