Built-in, discreet holder for the Apple AirTag*, Features minimalist, dual-side-loading design and cleanly hides the AirTag* between the bottle cage and bike frame for an added level of security, Constructed from lightweight, durable Composite Matrix material, IPX7 waterproof rating, Developed to be virtually indistinguishable from a standard water bottle cage, the Matrix Air Cage is a great solution to hide an AirTag* and utilize Apple's "FindMy" app to help locate a stolen or missing bicycle, Works with Apple's ultra-wideband signal, Includes stainless steel TR25 security bolts and tool bit, Ultra-wideband tested, Apple AirTag* not included