Using this Lezyne Femto USB cycling light set is easy. First, use the versatile mounting strap to attach the lights to your bike's posts. You can choose from five output modes according to your needs. When it's time to recharge, simply connect the included Micro USB cable to the light. Remember to keep the secure, threaded composite matrix cover on the USB port to keep it clean. This light set has an IPX7 water - resistant rating, but it's still a good idea to dry it off after getting wet. For long - term use, store it in a dry place when not in use. That way, you can enjoy clear visibility on your rides for a long time.