1.FUNNY BIKE BELL: There is a air screw on the helmet, it will fast rotate when you cycling. You need to have a special and unique bike bell for your bike, here it is2.UNIQUE DESIGN:Duck bike bell design with 12 lumen yellow lights,45 decibel sounds, press or pinch the duck bell tail, and it will scream up3.EASY TO INSTALL:First, pull the bottom band of this duck bells and twine it on your bike stick, then hook it with the S shape hook, and finish the installation, so easy. You can do it by your hands, no need any tools4.ADJUSTABLE:The propeller can rotate with the wind the helmets is detachable, you can take off helmet,the duck without a helmet is also very cute.5.A VARIETY OF USE:Duck bike bell can be used as a bicycle, motorcycle bell, or can be placed on scooters and strollers. It can also be used as a patient pager, or it can be placed in a wheelchair, pressed by a duck or lit to alert others. Also can be used as a child's toy, there are more features waiting for you to discover.