The Fenix BC06R is a smart-brake bicycle taillight that does something most taillights can't: it knows when you're slowing down. Built-in brake sensing instantly boosts brightness to a 90-lumen burst the moment you brake, alerting drivers up to 100 meters back exactly when it matters most. Versatile mounting fits most seatposts (25.4-31.6mm) and saddle rails (39-50mm), and a 270-degree lighting angle keeps you visible from nearly every direction. Multiple modes, including flashing and spinning light patterns, round out the visibility options, and an impressive 24.5-hour runtime means it's rarely the thing you have to remember before a ride. USB-C charging tops it off in just 2 hours, and IP66 waterproofing keeps it running through all-weather riding. Smart, simple, and genuinely safer — the BC06R is the kind of upgrade you stop noticing until it matters.