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With a built-in Swiss-made sensor, SwitchBot Meter monitors the environment reliably every 4-seconds. The clear and high-resolution LED screen of your indoor thermometer and hygrometer in 1 displays the large digits and battery volume, making them easy to read. If it falls out of the range you set in SwitchBot App, you'll receive a notification instantly when you are in Bluetooth distance (120 m/394 ft., unobstructed), aware of the changes in your cellar, basement, etc. via your phone.