Features： 1、Wind Speed Alarm Instrument: Provides alarm function with a matching connection cable to control desired devices and automatically cut off power when wind reaches the set level. 2、3 Cup Wind Cup: This anemometer adopts a 3 cup wind cup design for 360 degree wind speed measurement with high accuracy. 3、Wide Measurement Range: The wind speed meter has a wide measurement range and strong anti interference capability, with built in electromagnetic interference protection. 4、Power Failure Memory Function: Utilizes a CMOS chip with power loss memory function, saving time and energy. 5、Durable: The anemometer is made of aluminum alloy, ABS material, which is rainproof, dustproof and collision proof. Specification： Item Type: Tower Crane Wind Speed Meter Material: Aluminum Alloy, ABS Weight: Approx. 676g / 23.8oz Power Supply: USB 5V Input Voltage (Actual Operating Voltage): 220V Product Size: Approx. 10.8x7.3x3cm / 4.3x2.9x1.2in Mounting Aperture Size: Approx. 9.7x5.3cm / 3.8x2.1in Wind Cup Mounting Aperture: 4cm / 1.6in Wind Cup Cable Length: 8m / 26.2ft Suitable Scenes: Power Plant Wind Speed Measurement, Meteorological Station Wind Class Accuracy: 0.3 Class Accuracy: ±5% Startup Wind Speed: 0.7m/S Operating Temperature: -30-65℃ Package List： 1 x Tower Crane Wind Speed Meter 1 x Connection Cable 1 x Mounting Bracket 1 x Mounting Bracket Accessories 5 x Screws 5 x Nuts 1 x USB Cable 1 x Wind Cup With Cable