The Fenix BC06R Smart-Brake Bicycle Taillight is a high-performance safety light designed for cyclists who value visibility and convenience. Featuring smart brake sensing, it instantly boosts brightness to a 90-lumen burst when braking, alerting others up to 100 meters away. With versatile mounting options for seatposts (25.4-31.6mm) and saddle rails (39-50mm), it fits most bikes with ease. The light offers a 270° lighting angle, multiple modes (including flashing and spinning light modes), and an impressive 24.5-hour runtime. It fully charges in just 2 hours via USB Type-C and boasts IP66 waterproofing, making it durable for all-weather riding.