Innovative bicycle taillight optimized for aerodynamics and ease-of-use; Incredibly thin, lightweight and highly durable co-molded design; Max output 40 lumens or 30-hour runtime in Femto mode; 7 Output modes including highly disruptive Day flash mode; Wide Angle Optics for up to 270 deg of visibility; Simple and secure O-ring mounting system (Includes mounting O-rings); Magnetic clip mount Quickly unclips from magnetic base for easy recharging; USB rechargeable (Integrated USB-stick for cable-free recharging); Rigorously tested to IPX7 Waterproofing standards; 460mAh battery capacity