Easy to install - Includes two Allen wrenches (4 mm and 5 mm). When installing, use the hex wrench to fix the screw to the bicycle handlebar, then tighten it to ensure a firm closure. Handlebar Mirror - Acrylic convex mirror provides a larger field of view than traditional glass mirrors. - Fully adjustable 360° design allows you to observe all directions behind you. - Can be installed at the end of the handlebar to help monitor traffic while riding. - Note: remove the protective film (not the label) before use. Bike Bell - Made of aluminum and plastic with a coating process; wear-resistant, anti-rust, and waterproof. - The sound is loud and clear, helping you be heard while riding. - Fits most handlebars with a diameter of 7/8 inch (22.2 mm). Design - The bicycle mirror uses a high-impact nylon frame and a flexible, durable aluminum fixture. - Compact design is shockproof, and the folding feature helps it avoid obstacles. Use scenarios - Urban commuting: use the mirror to monitor traffic behind you for safer lane changes; the loud bell adds a clear alert to nearby drivers and pedestrians. - Road riding or casual rides: stay aware of riders and vehicles approaching from behind, improving situational awareness on busy streets. - Light off-road or trail riding: folding design helps you navigate tight sections and quickly stow the mirror when navigating obstacles.