We have featured amplifying case for your iPhone from Bone before in the form of the Bone Horn Stand iPhone Speaker. But this week Bone have introduced a new iPhone case to their range which allows you to attached and listen to your iPhone while riding your bike.

The new Horn Bike by Bone is a Eco-friendly silicone bicycle amplifier that requires no external power source. Its also equipped with an adjustable strap to fit all bicycles and can be set in almost any angle.

Bone explains the mechanics behind their new Horn Bike:

"Using the principle of the bugle, concentrating the voice and direct the conduction direction in order to reach the effect of increasing the volume, it can increase 13 db after use and does not need any supplementary electricity”

The Horn Bike is available to purchase for $30.

Source: Bone