Otona no Kagaku Product Edition Theremin Premium Set with Stand

The All Japan Theremin Festival is scheduled to be held in March next year, and the theremin is currently incredibly popular. This is the Otona no Kagaku (Science for Adults) Product Edition Theremin Premium.
I am including a separately purchased stand, perfect for tabletop use, as a set.

The Theremin Premium, an upgraded model of the Theremin mini, allows for pitch and volume adjustment using the two included antennas.

The instruction manual, music score collection, and original box are included.
The rubber on the wrist-worn earth band has stretched, so it has been replaced with a new one (one spare is included).
Additionally, the plastic adjustment screwdriver is missing, but I will include a handmade wooden screwdriver instead (metal screwdrivers cannot be used).
The antennas are slightly wobbly, but this is due to loose riveting from the manufacturing process and does not affect usability.

It runs on 4 AA batteries, has a built-in speaker, and a headphone jack (monaural).
External power supply cannot be used.

The stand is made of plastic, which has minimal impact on pitch/volume adjustment.
It also helps reduce the influence of metal table legs when used on a table.

For those who want to know what a theremin is, or who find the Theremin mini a bit lacking but are hesitant to purchase a more expensive model, how about considering this as an option?

Many sellers comment that tuning is difficult, but I believe this is probably because they are not following the instructions correctly.
The left Volume control is likely not that critical; it's sufficient if the sound simply gets louder. For the right Pitch control, I suggest not being too fussy with Pitch Adjust, setting it to a general position, and then finding the perfect spot using Pitch Trim (this is just my personal opinion).

There is very little yellowing, and it is in relatively good condition. However, please only purchase if you understand that this is a used item.