This well-made, classic bike bell is rustproof and emits a cheerful ding at 99db, a respectable volume that will ensure you can warn pedestrians and fellow cyclists well in advance of your approach. What makes it unique is that its stylish silver dome holds a secret: it's large enough to hide an Apple AirTag (not included) so you can track and locate your bicycle if you suspect it's lost, stolen or just simply misplaced. Made by the venerable Brooklyn Bicycle Company of lightweight, the Anti-Theft Security Bicycle Bell is constructed from sturdy aluminum with stainless steel and weatherproof parts. Features of the Anti-Theft Security Bicycle Bell include: Rustproof dome discreetly houses an Apple AirTag (not included), giving you a reliable way to track and locate your bike. The sturdy striker delivers a clear, resonant 99db sound—a loud & crisp alert—ensuring you're heard when it matters most. Stainless steel & weatherproof parts are built to last and ready for any adventure, rain or shine. Designed for 22.2mm handlebars with a sleek, laser-engraved Brooklyn Bicycle Co. logo. Includes step-by-step instructions for hassle-free installation. Measures 3.5h x 3w x 2"d.