Specification: Item Type: Fan Blades Tower Crane Anemometer Weight: 554g/19.5oz Power Supply: USB 5V Host Size: 115 x 60 x 30mm/4.5 x 2.4 x 1.2in Main Machine Mounting Aperture: 15 x 39mm/0.6 x 1.5in Installation Aperture of Wind Cup: 4cm/1.6in Wind Cup Cable: 8m/26.2ft Application Scenario: wind speed measurement in power plant, weather station Wind Level Accuracy: 0.3 Set Wind Level: 2-12 (can be set by 0.5 / each time) Accuracy: ±5% Starting Wind Speed: 0.7m/s Operating Temperature: -30-65℃ Material: Plastic Package List: 1 x Alarm Wind Speed Meter with Cable 1 x USB Cable  1 x Fixed Support  1 x Fixed Support Accessories  5 x Screw  5 x Nut  Features With the Connection Line Function: Power off after alarm, you can control the equipment that the customer wants to control, and the wind level will be powered off to the set level. Three Cup Wind Cup: The anemometer adopts three cup wind speed measurement, 360° wind speed measurement, high accuracy. Wide Measuring Range: Wind speed alarm measuring range is wide, anti interference ability is strong, with anti electromagnetic interference function. Power Failure Memory Function: The digital circuit of the wind speed alarm adopts a CMOS chip with power failure memory function, which saves time and power. In Normal Operation: The window wind speed shows the current actual wind speed; Set wind level to display the current alarm wind level; Maximum Wind level Indicates the maximum wind level of the day.