WITH BATTERY: The digital anemometer is equipped with CR2032 lithium manganese button battery, suitable for long term operation. LCD DISPLAY: LCD screen is used to display the current, average and maximum wind speed, and display the temperature of ℃ and ℉. EASY OPERATION: The wind speed thermometer is portable, and the button operation is convenient, can be used anytime and anywhere. MULTI FUNCTIONS: With LCD backlight display, manual and automatic power off, freezing and low power prompt, and charging status display. MAIN PURPOSE: This meter can be used to measure wind speed and temperature, with 5 units selection of m/s, km/h, ft/min, knots and mph.