Using the Lezyne Femto USB Drive Rear taillight is a breeze. First, use the versatile mounting strap to attach it to your bike's post. Make sure it's securely fastened. You can choose from five different output modes to suit your needs. When the battery runs low, just use the included Micro USB cable to recharge it. It takes about 2.5 hours to fully charge. For maintenance, keep the taillight clean by wiping it with a soft, dry cloth. Make sure the secure Composite Matrix cover is always in place to protect the USB port. Don't expose the taillight to extreme temperatures or harsh chemicals. If you have any issues, check the manufacturer's website for more troubleshooting tips.