●Smart App Control: A mobile phone can read multiple sensors. Conversely, a sensor also supports connecting unlimited number of Android phones user. 33ft Bluetooth range(No Obstructions). Simply download T-keeper app, monitoring temperature data in real time easily(Not wifi version). ●High Accuracy: Built in Japan-made smart thermometer sensor, temperature accurate: ±0.9℉(±0.5℃). Temperature range is -22℉~158℉(-30℃~+70℃). Recording a new and accurate temperature reading every minute. ●Free Data Storage & Export: Enjoy up 65000 readings. Enjoy 1 year of online data storage view and export it in PDF&CSV format comes. With calibration certificate to make sure the data is true and irreversible. ●Smart Alert: Alarm range, activation delay, logging interval (default 5 minutes), Temperature unit ℃/℉ etc. all can be configured in T-keeper APP. You’ll receive notification alert at once if temperature is out of preset range. ●Mini Size: BlueTag T10 is a multiple-use bluetooth temperature data logger recorder. IP67 waterproof protection. Cute size makes it suitable for refrigerator, wine cellar, cigar, baby room, freezer, basement, greenhouse, reptile vivariums, etc. especially incubator transportation. Complies to CE, RoHS, EN12830. We provide technical support via email and phone.