Using this product is easy. First, charge the battery using the USB port. You'll know it's fully charged when the indicator shows. Then, attach the light to your bike using the quick - release universal bracket RB - 22, which fits most bars. To turn on the light, press the button and cycle through the 7 different modes as you like. When the low - battery indicator lights up, it's time to recharge. For maintenance, keep it dry as it's only water - resistant to IPX 4 level. Avoid using abrasive materials to clean it. If you have any problems, contact our customer service.