A:AnswerI believe that the grey one was not selling as much of the rest in color, this color could also be over stocked, but rest assure they work great and I like the grey ones and you will too. Hope this answered ur concerns.
A:AnswerI have never timed it but i can go a full week or 2 without charging them. If i turn the anc on then the battery doesnt last as long. It says 40hrs without anc turned on and 22 hr with it on. The last a very long time a barely have to charge them and the sound is amazing.
A:AnswerYes and no. I have the 4k fire tvstick as well as the regular firestick from last year and it doesnt seem to work with the regular firestick for some reason at all.However it will work with the 4k one but its alittle sensitive to it .It will cut out completely if u press the cancelling button and sometimes the middle button so be cautious because it get very hard to connect the headphones after that.
