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The wind bell is the siren; its whistling is made by the wind tunned effect. Users can choose different sounds as alarms according to road conditions. The base is a revolving axle at 90 degrees and it can shut off the whistling while maintaining the alarm function. The bell is shaped by metal in 3D printer; it is both an alarm bell and a siren.
National Cheng Kung University
Tainan City, Taiwan
Chang Yu Pan
Kaohsiung county, Taiwan