Features1POWER CONTROL FUNCTION: This wind speed alarm can control the equipment that you want to control in case of an emergency, and automatically cut off power when the wind speed reaches the set level. 23 FAN BLADES DESIGN: This wind speed meter uses a 3 fan blades for accurate 360 degrees wind speed measurement, ensuring high accuracy. 3WIDE MEASUREMENT RANGE: The wind speed alarm meter has a wide measurement range and strong anti interference ability, with built in electromagnetic interference resistance. 4POWER FAILURE MEMORY FUNCTION: This wind speed meter uses a CMOS chip with power failure memory function, saving time and energy. 5WIND SPEED DISPLAY: The display of this wind speed alarm shows various wind values including current actual wind speed, wind speed level and maximum wind speed level, providing you with pleasant experience.SpecificationItem Type: Tower crane anemometerMaterial: Aluminium alloy, ABSWeight: Approx. 990g / 34.9ozPower Supply: USB 5VInput Voltage(Actual Withstand Voltage): 220VProduct Size(host): 18.3x10.5x5.1cm / 7.2x4.1x2inHost Installation Diameter: 17cm / 6.7inFan Blade Installation Diameter: 4cm / 1.6inFan Blade Cable: 8m / 26.2ftApplication: Weather station, wind speed measurementWind Level Accuracy: 0.3 levelSetting Wind Level: 2 to 12 levels (can be set sequentially at 0.5 levels each time)Accuracy: 5%Starting Wind Speed: 0.7m/sWorking Temperature: -30-65 DegreeCPackage List1 x Host 1 x Connection Cable 1 x Fixing Bracket 1 x Bracket Accessory 5 x Screw 5 x Nut 1 x Fan Blade with Cable