Features:OOTDTY1.Wind Speed,temperature and humidity measurement.2.Wind speed unit option: for m/s,ft/min,knots,for km/h,mph-.3.White backlight screen.4.Celsius and Fahrenheit unit switch.5.Max/Min/Average value.6.Data maintenance function.7.Wind- chill index prompt.8.Low power warning.9.Automatic power off.10.Calibration.Specifications:Main Material: PlasticModel: TL-300Type: 3 in 1(Thermometer/Hygrometer/Speed Meter)Color: Blue,Red,Black(optional)Wind Speed measurement range: 0.3-30m/sAccuracy: +-5%Temperature Measurement Range: -10 to 50- Degrees Celsius(14 to 122 Fahrenheit)Accuracy: +-1 Degrees CelsiusHumidity Measurement Range: 20%- to 90%accuracy: +-5%Resolution ratio: 0.1m/second, 1%,0.1 degrees celsiusOperating Temperature: 0 to 50- Degrees Celsius(32 to 122 Fahrenheit)Operating Humidity: 10- to 90%RHStorage Temperature: -10 to 60 Degrees Celsius(14 to 140 Fahrenheit)Storage Humidity: 10 to 75%RHPower Supply: 1 x Battery(Not Included)Size: One Size11x4.5x4cm/4.33x1.77x1.57inQuantity: 1 Pctype: CR2032Package Includes:1 x AnemometerNote:1.No retail package.2.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid.3.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!