5 size down and now fits perfect. So beware if you try to order this size. Since then, Aukey customer service reached out to me and replaced the original mouse - and it worked immediately, without special drivers, the moment I plugged it in. I would not wear beyond the water much, because the support is poor which is to be expected and can be hard on feet. Product works fine & looks good; however the product I received has only a 5? cord while the product description indicates that I ordered a power strip with a 6. In combination with the Roku app on our phones, they are very convenient and portable. Ive had no complaints about my voice quality from the other side. Chinese junk. To sum it all up, my best friend said it better. First, in my experience, when one color is out, the other colors are close behind, so the convenience of the combined cartridges is worth it.