Using the Kamen Rider Vital Brace is easy. First, put on the bracelet like you would a regular watch. You start as a human, and as you walk, run, or do other activities, the bracelet tracks your steps and heart rate. The more you do, the more your character grows. To battle other characters, just use the NFC function. Hold your bracelet close to another compatible device. You can also connect the bracelet to your smartphone app. When it comes to charging, follow the instructions in the manual. Keep the bracelet away from water and extreme heat or cold. If you want to clean it, use a soft, dry cloth. Remember, this is a fun collectible, so handle it with care.