Features & details Hidden Design AirTag Bike Bell: The anti-theft design of this bike bell ensures your AirTag is invisible. Simply turn the top of the bell and hide the AirTag inside for easy tracking in case of loss or theft (AirTag not included). This discreet design keeps your AirTag safe while also serving as a classic bicycle bell. Lound Sound Bike AirTag Holder: ROCKBROS classic bike bell is crafted from high-quality copper alloy to produce a clear and loud sound. With high decibels and strong penetrating power, this bell effectively reminds passersby of your presence, making it great for safer riding. Water-resistant Bicycle Bell: This bell comes with a sealed waterproof rubber ring to protect your AirTag from rain, making it perfect for riding in wet weather. With this waterproof bell, you can enjoy rides in various weather conditions. Please note that it can not be exposed to heavy rain for prolonged periods of time. High-Quality & Lightweight: This AirTag bike bell features excellent workmanship with a vintage design, high-strength springs, and durable plastic that is anti-rust and anti-aging. The strong and durable construction ensures long-lasting performance. Despite its sturdy build, the bell is incredibly lightweight at about 62g, making it easy to use. Easy to Install: This Air Tag bicycle bell is easy to install and remove, just tighten the screw on the handlebar with an Allen wrench included, compatible with most bike handlebars with 0.87’’,1’’,1.25’’ diameter. To ensure a perfect fit, please measure your handlebar diameter before purchasing.