Three-Channel Wireless Sensor- With the built-in console and three remote sensors, the thermometer can simultaneously display room temperature and three sets of outdoor temperature and humidity. You can put it anywhere you want. Maximum/Minimum Record and C/F Switch- Press MIN/MAX to display the highest temperature and humidity. Press again to display the minimum value. Press again to restore the current temperature and humidity. Press C/F key to switch between Celsius and Fahrenheit. Large LCD display and backlight- Large LCD display with simple and clear readings. Press the "Light" button to turn on the backlight. If there is no operation, it will automatically shut down within 5 seconds. Signal Strength and Comfort Display- Wireless transmitters enable strong signal paths. 100M host and transmitter signals are free to receive. The comfort symbol indicates air conditioning - Wet / Adapted / Dry. If you have any questions, do not hesitate to contact us. For more about settings, please refer to description section below and manual ( Manual is only in English, not French ) Multiple Installation Methods- Easy to install. The host can hang and can stand. The thermometer requires 3 AAA batteries and each transmitter 2 AAA batteries (Not Included). We offer one year warranty. If you have any questions, please feel free to contact us, we will do our best to provide you with a satisfactory solution.-