1. Universal Compatibility: This taillight mount fits most bicycles, ensuring seamless integration with your ride. It enhances your cycling experience, improving safety and convenience.2. Multi-functional Design: This bicycle taillight mount doubles as both a taillight holder and a discreet, highly concealed holder for AirTag trackers. It securely fixes your tracking device to help prevent bicycle theft.3. Adjustable angle: Vertical base installation compatible with Garmin TL300, RTL500/510/515, RVR315; Horizontal base installation compatible with Magene L508 Taillight, iGPSPORT SR30 Taillight. 4. Durable Construction: Made from a plastic cover aluminum alloy base aluminum alloy bracket, ensuring robustness, durability, and a compact, portable design.5. Note: Only the mount is included for shipment; tracker and taillight are NOT included.