Eco-friendly silicone bicycle amplifier (no external power source required). Shock-proof scratch-proof and washable silicone. Features an adjustable strap to fit all bicycles and can be set in almost any angle.Bugle loudspeakerUsing 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 it is absolutely environmental friendly saves energy and reduces emission.Micro PatternUsing micro pattern the surface can show three-dimensional patterns and would not lose colors.100% Bio-degradableUsing the environmental friendly materials which can be deposed in the nature.Format: PORTABLE AUDIO/CELLULAR ACCESSORIES Genre: SPEAKERS Age: 4716076151374 UPC: 4716076151374 Manufacturer No: LF11011-B