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The Wind Gauge
It uses the very latest in ultrasound technology to reliably and accurately measure the wind's speed and direction, including those of wind gusts. You can configure how you want to be alerted if the wind reaches a certain speed and also receive more precise "feels like" temperature using the Weather Station App.
The Wind Gauge is equipped with four ultrasonic transducers that emit continuous signals. The Wind Gauge uses variations in these signals to reliably and accurately measure wind speed and direction.
4 AA batteries