Brand New Portable Auto power off Sailing Surfing Digital LCD Instruments Anemometer Wind Speed Velocity Meter TravleSpecification:Item Size: like the picture show.Lanyard： 43.5cm/17.13"Air Velocity:Range: 0 - 30m/s， 0 - 90km/h， 0 - 5860ft/min， 0 - 65mph， 0 - 55KnotsResolution: 0.1m/s， 0.3km/h， 19ft/min， 0.2mph， 0.2KnotsThreshold: 0.1m/s， 0.3km/h， 39ft/min， 0.2mph， 0.1KnotsAccuracy: +/- 5%Air Temperature:Range: -10 - 45℃， 14 - 113℉Resolution: 0.2℃， 0.36℉Accuracy: ±2℃， ±3.6℉Power Supply: 1 * 3V CR2032 (battery is included)Thermometer: NTC ThermometerOperating Temperature: -10~45℃ (14~113℉)Operating Humidity: less than 90%RHStore Temperature: -40℃~60℃， -40℉~140℉Current Consumption: About 3mAItem Size: 105 * 40 * 18mmItem weight: about 52gDimension: about 40mm(L) X 18mm(W) X 105mm(H)Features:Wind speed measure in mph， ft/min， K/h， m/s or Knots.Wind speed in Beaufort wind scale bar graph.Wind chill display.Temperature display in Celsius or Fahrenheit.LCD back light.Auto power off.Neck band included.3V lithium battery operation.(battery is included)Package included:1 X LCD Digital Anemometer1 X Lanyard