Blue Lug original light. Tiny but powerful. The light emanates 20 lumen and has 2 lighting modes - steady and blink. The battery lasts for maximum of 20 hours (nominal value) and is rechargeable with an USB cable. When you need to recharge, the light can be detached from a mounting tip. Included are 2 types of bolts which allow you to easily install the light on pretty much any part of your bike. SPEC - Light color : white (front) - Power : about 20 lumen - Light modes : steady, flash - USB chargeable (about 2 hours) - Material:Aluminum - Outer diameter:about 3cm - Come with M5, M6 bolts