Thank you for viewing. This is a Yamaha RY8 Rhythm Programmer. It is a portable sound module. It can be powered by an adapter or 6 AA batteries. It's compact, easy to carry, packed with necessary features, and a very user-friendly model. This is a used item, so there are scratches, marks, and minor rust. I confirmed its operation with the dedicated adapter, but the adapter's cord has poor contact, so you may want to prepare your own. I have not confirmed battery operation. It has many functions, so please understand that I have not confirmed whether all operations are possible. If you need the adapter with poor contact, it can be included for an additional 500 yen. This model is no longer in production, so it's hard to find. I do not have detailed knowledge of the equipment, so I may not be able to answer questions. Please be aware that this is a used item from a previous era, so it has some wear and tear. I have generally checked it, but there may be oversights in the details, so please forgive me. Please purchase only if you understand that this is a used item from a previous era. Thank you. Rhythm Machine Machine