4. All in all, definitely give these a shot. Pairing worked fine and was quick. First, the Rachio was simple to install. I bought a size larger than I normally wear and persevered for a couple of days as per the instructions, but I am sorry to say, I have given up and am going to return them. Product fits a bit small but only by 1/2 size. Not the best quality and noise cancelation is not as good as expected. First of all for the price I was expecting these to be used for a little while and throw away type of headphones because I go through headphones so quickly! Im going to buy 6 more so I never have to not wear them again. Go to the manufacturer and find it there