Description : - As a bicycle safety warning light, 20 lumens output is enough, it is bright, compact, easy to carry, Leave your screwdrivers in the toolbox, and detaches in under 2 seconds with NO tools required. Can be mounted almost anywhere. - Takes 2-3 hours to fully charge and has a Runtime of 4-10 hours on the highest setting. A fixed bracket prevents accidental focus movement. - Inner protector to protect the handlebar measures 6cm x 2cm. Compatible with tactical flashlights 24 to 27mm in diameter. - Save the Hassle to Replace Batteries Every Week! They charge from your computer or any device with a USB port. - Ideal for trails and situations where safety is paramount. Water-resistant, can be used even in the rain. Firm and accurate, it prevents flicker and flick of the flashlight. - Suitable for the professional or casual bicycle rider.