Hi Leo,
They are quite similar to DH Gate. They are a marketing portal where buyers can search for almost any product they can think of. They are using escrow for their payments which is quite safe and they have been online for roughly 5 years.
If you do wish to buy from them, remember to stay away from anything offered as branded as this is a China site, 9 out of 10 times these branded product will just be fakes/counterfeits or knock-offs.
Since I have no personal experience with beltal.com I did a quick search about them for you and found mixed reviews from those who have used this site. Below are a couple of links to reviews and comments about Beltal.com:
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Hope this helps. Cheers :)