This product is very funny, You can buy them as a serious product, also you can buy them as a Gag/hilarious gift. Want to draw attention to yourself during a twilight group ride, or make the rider waiting next to you at a stoplight turn and stare? Cyclists are often neglected by others on the road. Now, this warning light will change things. This light is a rear bicycle light designed to be mounted on the back of your bike seat. They hang off of the seat rail, and naturally bob-around while you ride. Users just need to gently squeeze the light to switch on or switch off the light. A gentle squeeze is also needed to switch between the three modes.