5 fit the best. From the RGB colour profiling, to the smooth tracking across the RGB Razer mousemat (Goliathus, extended version) its heavenly compared to my previous G203 Prodigy from Logitech. Jen ai commandé une paire pour moi. Itll drive you mad. maybe these should be sized differently? I can imagine how perfectly they would fit if I went down a size. 5 hrs, the touch controls and connection Bluetooth 5. I use my earbuds at work and am very careful to keep my cables secure and out of the way while working. The three lights on the case seem to serve at least two purposes. It is 3 inches smaller when I wrap it around but that is recommended to go smaller than your natural waistline. )- External noise reduction is almost too good.