Using the Lezyne Strip Drive Pro 400+ Rear LED light is easy. First, use the versatile mounting system to attach it to your aero or round seatpost. Then, turn it on and choose from the seven different output modes according to your needs. The Daytime Flash mode is great for getting noticed during the day. For longer rides, you can select a mode with a lower lumen output to save battery. When it's time to charge, use a USB - C charger (cable not included) to charge the light. Remember to keep the light dry as much as possible, even though it's IPX7 waterproof. If it gets dirty, you can gently wipe it with a damp cloth. Also, don't overcharge the battery. When not in use, store it in a cool and dry place.