Using your Lezyne KTV Drive rear light is easy. First, find a suitable aero - post on your bike and attach the light securely. Press the button on the light to switch between its five output and flash modes according to your needs. For example, you can use a steady mode for well - lit areas and a flash mode for better visibility in darker places. When it's time to recharge, just plug the integrated USB stick into a power source like a laptop or a power bank. To keep it in good shape, after each use in wet conditions, dry it off gently. Avoid exposing it to extreme temperatures. And if you notice any issues, contact Lezyne's customer service for help.