Wireless temeprature sensors are used to measure temperature in rooms, warehouses, pharmaceutical wholesalers, museums or in vehicles, during goods transportation. Sensors work with Android applications (Efento Inspector, Efento Transport, Efento Logger) and Efento Cloud platform. The battery ensures maintenance-free operation for at least two years. The sensors communicate wirelessly with smartphones or Efento Gateway in Bluetooth Low Energy technology. The maximum range is approx. 100 m in line of sight. Temperature sensors have built-in memory which stores 28 000 measurements.