1. Funny Bicycle Bell: There is an air screw on the helmet that rotates quickly when cycling. You need a special and unique bike bell for your bike, here it is. 2. UNIQUE DESIGN: Duck bike bell with 12 lumens yellow lights, 45 decibels of sound, squeeze or squeeze the duck bell tail and it will scream. 3. Easy to Install: First pull the bottom strap of these bells and tie it to your bike stick, then hook it with the S-shaped hook and finish the installation, so easy. You can do it with your hands, no tools required. 4. Adjustable: the propeller can rotate with the wind, the helmets are detachable, you can take off the helmet, the duck without a helmet is also very cute. 5. Versatile: The bicycle bell can be used as a bicycle bell or a motorcycle bell. It can also be used as a patient pager, or it can be placed in a wheelchair, pushed by a duck, or illuminated to warn others. Can also be used as a children"s toy, there are other functions waiting for you.