Using the KTV Drive Pro+ Rear bike light is a breeze. Simply attach it to your aero seatpost. You can switch between the six output modes by pressing the button on the light. For long rides, use the mode with lower lumens to extend the battery life, which can last up to 20 hours. When riding during the day, turn on the Daytime Flash mode to make sure you're easily seen. As for maintenance, keep the light clean by wiping it with a soft cloth. Since it's IPX7 waterproof, it can withstand light splashes and rain, but avoid submerging it for a long time. When the battery runs low, just plug the integrated USB stick into a power source for recharging.