Why is this sanwulaser so cheap?

Hi all,

I'm just looking to buy a good laser and most on here recommends sanwulaser.com

I'm looking for a green laser 532nm 50 - 150mw

So I came across this laser:

https://www.sanwulasers.com/product/304

I think it's a good one but the price seems to be very cheap at $15 compared to other lasers around with similar specs...

So my question is guys...Why??

Thanks.
D.