The product is poorly built. So you cannot use speakerphone mode. On the other side you hear loud noises in the background. Because there is no dedicated hole for the microphone and it comes out along with the speaker in that hole. After correspondence with the seller, his suggestion was that I make a hole in the shield and he would return $ 5 to me (For a product you paid $ 26) ..
Very bad product !! Do not buy.! Makes terrible noises in the speaker. Bad service are not willing to take responsibility. Their solution is to make a non-dedicated hole in the shield by a drill.
best case I ever had. Highly recommend.