1. Fun Bike Bell: There is an air screw on the helmet that rotates quickly when you ride. You need a special and unique bike bell for your bike, here it is. 2. UNIQUE DESIGN: Duck bike bell with 12 lumen yellow lights, 45 decibels sound, pinch or press the duck bell's tail and it will scream. 3. Easy to install: First pull the bottom strap of these bells and tie it to your bike post, then hook it with the S-shaped hook and complete the installation, so easy. You can do it with your hands, no tools needed. 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 bike bell can be used as a bike 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 lit up to warn others. Can also be used as a toy for children, there are other functions waiting for you.