Features: Engineered with a high decibel aluminum alloy , this bike delivers , long lasting tones to effectively alert and cyclists in noisy environments, ensuring safety with every ride. Weighing just 24g and crafted from aluminum plastic composite, its design effortless portability, weather resistant durability, and tool installation for seamless compatibility with mountain, road, or folding bikes. Ideal for commuters, cycling enthusiasts, and families seeking safety gear, it caters to riders of mountain bikes, road bikes, and bicycles for daily or recreational use. Perfect for navigating crowded streets, busy , or quiet neighborhoods, its penetrating sound through noise to keep riders visible during commutes, group rides, or leisurely explorations. Combining bike compatibility, resistant materials, and intuitive旋钮 mounting, this ensures hassle adaptability across while enhancing骑行 safety with minimal bulk. Specifications: []Aluminum alloy, plastic Dimensions: Approx. 7cm/2.75 [Weight]about 24g Applicable to: mountain bikes, road bikes, folding bikes, small bikes Package Includes: Bike 1 note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.