WHAT'S IN THE BOX? Bluetooth, solar-powered and IPX8 pocket-sized ULTRASONIC anemometer. This self-powered Bluetooth 4.1 ULTRASONIC windmeter can work for 29 days without charging while measuring, and an entire year in sleep mode thanks to its solar panel. Built with ULTRASONIC sensors, it will provide you with one of the greatest accuracies we have ever achieved in an anemometer. Allowing a continuous measurement of wind speed and direction. Technical specifications Wind Speed Range: 0 – 25 m/s Resolution: ±0.1 m/s at 10m/s Wind direction Range: 0 – 360º Resolution: ±1º Sensors Ultrasonic transducers (4x) Sample rate: 1, 4, 8 Hz Secondary sensors: Thermometer, Gyroscope, Accelerometer (Accuracy may vary depending upon the App used, its release and the firmware version) Power Solar panel, internal battery, automatic power management. Autonomy with no sunlight: in sleep mode up to 1 year, while measuring up to ~30 days. Bluetooth Version: 4.0 or beyond Range: Up to 50 m (free space) Firmware Upgradable (Learn more) Current version: 0.76 IP Code IPX8 protection grade (10 meters). Dimensions Diameter: 70 mm Height: 57 mm Weight 135 grams Easy mount 16 mm (M16x2) female thread