HDMI Switcher 2x1 Multiviewer with PIP

Purchased from another site about 3 years ago as new. However, after opening and testing the operation once, it has been stored without use.
It appears to be currently selling for 29,900 yen on Amazon.
Everything shown in the 6th photo is included.

Product Description:
Brand: DAIAD
HDMI PIP (Picture-in-Picture) HDMI

Allows you to display two input video sources on one screen, with one video appearing as a small window within the main screen, enabling real-time wipe display. The size of the wipe video can be adjusted in 3 levels and moved to any of the four corners. Easily switchable via buttons on the unit or remote control.
Features four display modes: full screen switching, left/right split screen, equal left/right split screen, and PIP. Make effective use of your single LCD TV and never miss important moments on TV or other sources. For remote work/telework, you can simultaneously view two video sources by making your game console, Blu-ray recorder, or other HDMI devices into a PIP multiviewer while on Zoom or Skype calls.
Input Resolution: Supports up to 1080P@60Hz Full HD. Output Resolution: 1080P/720P/1080i/1024×768/1360×768.