Idea Design Bellpipes Bicycle Alarm Bell by CHANG-YU PAN Bellpipes is an innovative bicycle bell. It combines a whistle with a bell and allows cyclists to choose different sounds as alarms according to the road conditions they face. The Bellpipe whistling is made by the wind power. Through The wind tunnel effect it can make sound with no electric power. The speed of the bike make the wind blow the whistle and sound the alarm. When The cyclist need to make long time alarm sound. They can switch the Bellpipe to whistle mode. The base of the Bellpipes is a revolving axle at 90 degrees. It can shut off the whistling while maintaining the bell function.