INKBIRD Pocket-Sized Sensor Bluetooth-Compatible Temperature Humidity Sensor Wireless Thermometer With Data Storage/Export This device can be universally used tomonitor the storage environment of guitars, pianos and other instruments, cigars, warmers, wine cellars, incubators, weather station, refrigerators and freezers. Bluetooth-Compatible Temperature & Humidity Sensor: Bluetooth-Compatible Sensor--- WirelessControl Range30 meters.Free App for IOS & Android. One mobile phone can monitor several sensors at the same time, and vice versa, one sensor can be monitored by a few mobile phones. Data Storage & Sampling Interval--- Hold data for 20 days if the sampling interval is 1min, and the max date storage is 30000 points. Different sampling interval can be setting.(10s/ 30s/ 1min/ 2mins/ 5mins/ 10mins/ 30mins) The saving data time will be different if you choose different sampling interval.The history data could be exported via CSV file. History and Immediately Data Review--- History and immediacy data can be remotely checked through Bluetooth. App Functions--- As a data logger, it supports temperature graph, interrecord gap setting, alarm and calibration. Support for application scenario selection and addition. 12-Month Warranty--- Our product is under 12-month warranty,