Wind Power Bird Repeller 360 Degree Rotary Device for Driving Birds Away Crop Pigeon Crow Pests Scarer Orchard ProtectionWorking Principle:This product does not need to be connected to the power supply. It uses the power of the wind to rotate the fan blades. The mirrors on the fan blades reflect the sunlight to form a flashing band, which causes a visual shock to birds, and uses this visual shock to drive away birds.Features:1. It needs to be driven by wind power of level 3 or above, and rotates 30-50 times per minute. The birds repelling effect will be more obvious in a sunny and windy environment.2. The product is made of ABS material and hot-dip galvanized steel, which is anti-rust, anti-corrosion and durable.3. Use wind power as power, making it energy saving and environmentally friendly.Applicable Places:Transmission towers, iron towers, substations, farms, orchards, fish ponds, warehouses, large workshops, food processing plants, airports, ancient buildings and other places.Product Size:Large Size:Rotation Diameter: 36cmOverall Height: 29cmMirror Diameter: 6.5cmNumber of Mirrors: 4 (with a small mirror on its top)Small Size:Rotation Diameter: 18cmOverall Height: 29cmMirror Diameter: 4.5cmNumber of Mirrors: 3 (without a mirror on its top)