Compact yet powerful rear light that ensures optimal visibility and safety on your rides\n With a maximum output of 40 lumens, an impressive 45 hour runtime in Femto mode, and six different output modes, including Daytime Flash, this rear light provides reliable illumination\n Unique design is compatible with aero and round seatposts, ensuring versatility for various bike setups\n WideAngle Optics lens design provides 270° of visibility. An integrated USB stick allows convenient cablefree recharging\n Rigorously tested to IPX7 waterproofing standards, it can withstand challenging weather conditions