The product itself, if you're lucky and recieved ones that work as advise, you're lucky. My one work on one side and didn't work on the other. If they both work, they are poor quality.
Don't buy from these guys. They send you defective product and pretend to make right by telling you they'll send you a replacement product with good customer service. When everything is arranged and the 15 days refund date has pass, they'll cancel the delivery with no explanation.
Basically, no intention to resolve anything, just a broken promise and wait for the 15 days refund policy to pass so aliexpress wouldn't step in.
These guys are crooks.
If you'd already bought from them, and the product is good, you're lucky. If you're the unlucky ones like me, you'll get scam.
Word of advise, if the product that you bought the product andnit's defective, initiate the refund process with aliexpress right away and don't even bother with chatting with the seller. You'll ended up just wasting time and money.