The sound and performance are wonderful. The Adesso Quatro Coat Rack features an attractive design, sturdy construction, and best of all, an abundance of hooks for hanging garments. For the size "J3" - I could not find out what that meant exactly from the manufacturing, but I ordered them since that was the only size 3 available I could find at the time I bought these (end of October) and I figured others were ordering for Christmas or to get warmer shoes for the cold weather approaching - so selection seemed to be limited. but this G403 is a Wired mice, so If you already have a G403 the regular one with the 3366, not worth it to upgrade to this one. They are very easy to connect to your cell phone, after the first pairing and only when it is stored in the charging case, close it and re-open and re-pair it automatically. Also, the overall size doesnt fit PS4 controller chargers that have an upside down mounted cradle technique. I will be buying more colors. The all black color goes with just about everything. This is my fourth pair of this slipper, just different colors. You can also hear your hair rub against the pads, a little annoying but not too bad.