SYKIK SRHL7 is a bright light for your helmet. Placed on back or your helmet to help you be seen day or night. With 14 LED lights it is visible from far, even at day light. With built-in rechargeable battery, can be used for over 14 hours on a single charge. Charges through USB port (charging cable included). Water proof to be used in rain or shine. Placed on back of your helmet via Velcro for easy installation and removal. Easily transfers between your helmets. Great for motorcycles, scooters or bicycle helmets. Measurements: 3.5" long, 1.5" wide and 1" thick. Weight: 1.7 OZ. Units comes with USB (C) charging cable, and 2 sets of Velcro