Digital Theremin Mini Theremin Theremin+ Chinese Theremin

No operational issues, produces piano sounds, etc. This is a gadget (toy), so please consider it for introductory purposes only. If you wish to use it as a professional instrument, please consider purchasing a Stylophone Theremin or similar.

Color display and built-in speaker
Headphone (earphone) output included (monaural)
Powered by USB connection (Type C) only (no rechargeable battery or dry battery compartment)
Operates with two included antennas connected
Over 70 built-in tones
Main unit dimensions: Approximately 9.7 x 7.0 x 1.8 cm

With string-like tones, you can play songs using the same method as a standard theremin. However, due to its small size, please understand that it is fundamentally a toy and not a professional instrument.
With percussion, stringed percussion, and plucked string instrument tones, the left antenna is used to simulate plucking strings, and the operation differs from a standard theremin.
Includes sound effect tones.
No detailed instruction manual was originally included.
Those familiar with games should be able to use it, but those who are not very familiar with the theremin itself and are not accustomed to English electronic instrument terminology may have some difficulty.

Operation is performed using the four buttons located at the bottom center-right.
It's a bit unclear, but use the left button and up/down buttons to select menus (Settings / Volume / Pitch / Timber / ANT Calibration) (see 6th photo), and use the right button to select tones, etc.
Tone selection is done within the Timber menu.

Everything shown in the photos is included (main unit, two antennas, USB cable).
Used only a few times at home after purchase.

For those who want to know what a theremin is, or are considering the Theremin mini or Theremin premium, how about this as one of your options?