This bicycle bell is 80dB high decibel warning sound, let you in noisy streets, open the road without obstruction. Features: Small size and lightweight, does not hinder cycling and does not increase the burden of cycling. The sound is loud, effectively reminding pedestrians to avoids. Simple to assemble and disaeemble. USB rechargeable design, you don't need to worry its battery. 6 bell ringtone modes adjustable. Specifications: Color: black, camouflage (optional) Material: ABS Battery: 3.7V, 150mAh Suitable handlebar diameter: 22-31.8mm Item size: 40 * 40mm / 1.6 * 1.6in Item weight: 35g / 1.2ounce Package size: 90 * 70 * 42mm / 3.5 * 2.8 * 1.7in Package weight: 54g / 1.9ounce Packing List: 1 * Bicycle Electric Bell