?SUPERIOR PROTECTION?The AirTag bike Holder comes with 3 TPU sleeves to accommodate different size seat post. It keeps the bicycle airtag mount held tightly in place and your bike from scratching. It fits round seat post diameter with 27.2mm, 30.9mm and 31.6mm, such as mountain bike, road bike, electric bicycle and scooter. ?QUICK & EASY TO INSTALL?Bike rear reflector conntected the bike airtag holder via quarter-turn mount, it is easy to install and dismantle by turning. Its rigid attachment allows you to remove the Varia with one hand. Pefect Apple AirTag accessory gift for everyone who loves cycling. ?ROBUST BASE & HIGH TRANSMITTANCE REFLECTOR?The Airtag bike mount case is made of advanced injection moulded co-polymer. It is strong and sturdy enough to hold your Varia radar or tail light stable and securely on your bicycle no matter the terrain. The AirTag bike reflector is made of lightweight and durable high transmittance GPPS. It has excellent performance of high reflectivity. Alert cars to your presence on the road, ensuring your safety when riding at night. ?INVISIBLE ANTI-THIEF DESIGN? Hide an airtag behind a regular reflector and fix the cover by screw. It's a perfect way to hide the AirTag securely and looks like a ordinary bike light, a part of the bike. Thieves and people passing by won't realize an AirTag is behind the bike reflector. Discretely attach to your bike to easily track if lost or stolen, or monitor your kids' movements. ?VERSATILE AIRTAG BIKE MOUNT?This Apple AirTag holder is not only a hidden Air Tag bike mount, but compatible with garmin varia . It is compatible with Apple AirTag, Garmin Varia cycling rearview radar with tail light RTL315, RTL510, RVR515. ** AIRTAG NOT INCLUDED**.