The Yellow Speed is a really small company in Taiwan, there are only 5 employees working there, itís like a household factory, also there is no ISO approval for the products they make. Itís the company which specialized in pirating othersí products.
In fact, Yellow speed established 10 months ago, the person who in charge of Yellow Speed company used to work in D2 company, but he got fired due to theft. So far D2 has started to sue the company, as I notice, they pirate D2ís patent as well.
If there is someone who is interested in buying their products, perhaps it wonít be under any warranty as the company might be out of business at any time.