An AC adapter would require a more complex machine than what we offer!  There are two very practical reasons for this: 1. An AC adapter wheel will be more expensive and we don’t know that you want to make that kind of investment; and 2. We aren’t sure if this a toy that your child will enjoy and want to keep for years.  Buying a more complex machine involves a commitment, which, while it may ok for you, your child might not understand. We’re simply thinking about you as a parent and what will be most cost-effective.