【Bicycle Tail Light to Hide AirTag】This product is used as a regular bicycle taillight, which can improve the safety of your bicycle at night, and also has the ability to hide the AirTag, which can improve the security of your bicycle. However, AirTag must be prepared separately. 【Easy and Convenient Installation】This Zoo bicycle airtag mount tail light is compatible with the standard bicycle seat diameter (0.9 - 1.2 inches (22.2 - 31.8 mm)), and you can choose the suitable one from the 5 TPU rings included for easy installation. 【Heavy Duty Material and Secure Installation】This Zoo Bicycle AirTag Mount Taillight is made of aluminum alloy and high quality durable ABS material, high quality TPU ring is durable enough to withstand harsh weather conditions and stay firmly in place even in long wind and sunlight. 【Suitable for Various Bicycles and Different Size Seat Tubes】This Zoo Bicycle AirTag Mount Taillight comes with 5 TPU Rings and is designed to fit various sizes of vehicle seat pipes and other areas. It can be used on a variety of bicycles such as mountain bikes, road bikes, electric bikes, scooters, and other general seat pipe sizes such as 31.8mm, 28.6mm, 27.2mm, 25.4mm, 22.2mm. 【PROVIDES LONG-TERM WATERPROOF PROTECTION】The professional waterproof design allows the AirTag to dry for a long time and maintain normal operation.