Seriously...
I was surprised that this Chinese-made mini monitor, which costs about 6,000 yen, has better color quality than the main display I'm currently using.
The quality is good and it's an interesting product, so I wish there were more mini monitor products like this.
Moreover, it arrived in about a week, so if you are considering purchasing from Amazon, it's definitely better to buy from this AliExpress store.
The only downside is that when the signal from the PC is lost, it doesn't enter sleep mode and the "No signal" message stays on the screen. There's no problem as the power button turns it off when pressed, but I'm concerned because I frequently put my PC into sleep mode.