Using the Knog Blinder Link Rack Mount is easy. First, choose the rack mount option and use the unique clip design to attach the light to the back of your bike rack. You can quickly remove it when needed. There are 8 different modes, so you can pick the one that suits your riding situation. When charging, use a USB - C cable, and it will take about 4 hours to fully charge. The light can run for up to 50 hours on a single charge. Remember, this light is 100% waterproof, but it's still a good idea to dry it off if it gets wet. Check the low - battery indicator regularly. If it shows low, charge it as soon as possible to ensure you're always visible on the road. Keep it clean by wiping it with a soft cloth from time to time.