Using your Livall C21 Smart Bike Helmet is easy. Just put it on like a regular helmet and connect it to your phone if you want to use all its features. When riding, the smart lighting and safety features work automatically to keep you safe. In case of a fall, the fall detection and SOS system will do its job, so make sure you've set up your emergency contacts. The sun visor can be attached or removed quickly when needed. When it comes to maintenance, use a soft cloth and mild soap to clean the helmet. Avoid using harsh chemicals. Also, keep it in a cool and dry place when not in use. And remember, if it's been involved in a serious impact, it's time to get a new one for your safety.