Using the Digimon Adventure D - 3 25th Color Evolution is easy. First, charge the rechargeable battery before your first use. Once it's charged, power on the device and start your Digimon adventure. Navigate through the full - color screen to access different functions. You can enjoy the in - show dialogue and BGM that add to the immersive experience. To trigger these sounds manually, switch to the playback mode. When it comes to compatibility, feel free to connect it with past releases such as the Digivice 25th Color Evolution or link it with other D - 3 devices for battles. As for maintenance, keep it in a dry place and avoid dropping it. If you have any issues, check the battery connection first. And don't forget, you get free shipping within the Continental USA.