Blackburn Click USB Rear LightJust press the lens and, CLICK, now traffic will be more likely to see you! A silicone mount lets you attach this powerful little light almost anywhere, and the handy LED fuel gauge tells you when its time to recharge with its micro USB cable. No more batteries just charge, click and go! Meets ANSI FL 1 Standard 20 lumens Universal Mount, Action camera style mount fits most helmets and handlebars 2235mm in diameter. No tools required. Lithium polymer