KORG monotron Delay Analog Synthesizer - with Box

Operation confirmed.
Although removed from the case, the item is practically unused. It has been stored at home, so the box shows some signs of use.
Also, I do not have technical knowledge, so I cannot answer specialized questions.

▪️Product Description
The monotron DELAY features an analog echo-like delay, producing intense sound effects.
Two companion models have arrived for the battery-powered, palm-sized analog synthesizer, monotron. Like the monotron, the controls are simple and straightforward, featuring just five knobs, one switch, and a ribbon controller keyboard with added functions for each. The possibilities for enjoyment are endless, whether light users want to easily play melodies or DJs want to use it for sound effects on stage.
This is an analog synthesizer that even beginners can easily use.