Electronic Monitor Switch SW-EV4

Purchased 8 years ago, used a few times, and then stored at home.
Operation confirmed to be problem-free.
The plastic outer box is damaged due to age-related deterioration, so it is listed as having scratches and dirt, but the main unit itself has no major scratches or dirt (please refrain from purchasing if you are sensitive about this).
The usage instructions are written on the green outer box, so you should be able to use it right away.

Specifications
Resolution: Up to 1920x1440 dots (refresh rate up to 85Hz)
Bandwidth: 250MHz
Interface: Input/Mini D-sub (HD) 15pin female x 4, Output/Mini D-sub (HD) 15pin female x 1
Switching: 4:1
Power: DC9V
Power Consumption: 1A
Operating Temperature/Humidity: Temperature/5-40℃, Humidity/0-80%
Material: Steel
Size: W128 x D75 x H45mm
Weight: 468g
Accessories: AC adapter (DC9V, 1A)
List Price: ¥7,880

Features
Allows you to switch and share one display among 4 computers.
*This product cannot switch between 4 displays for one computer.
Uses an electronic switch that is less susceptible to noise interference.
Features a steel case that is resistant to external noise.
Supports high resolutions up to 1920x1440 dots (refresh rate up to 85Hz) and a bandwidth of 250MHz.
Includes an AC adapter.
*Connection cables are not included with this product. Please use separate connection cables.
(e.g., Sanwa Supply models KC-V07, KC-V1, KB-CHD152K, KB-CHD154K)
*This product does not support DDC signals. It may not output correctly depending on the graphics board.
*Computers connected to ports that are not currently switched will appear as if no display is connected. Depending on the computer, external video output may be stopped, or resolution settings may be reset. This is due to the specifications of the computer (graphics board) and cannot be supported by this product. Please be aware of this in advance.
*Mini D-sub (HD) 15pin = HD (3WAY) 15pin.