A:AnswerI have a MacBook Air and they do work with mine. Just have to remember that you need to go select them under the sound option. So yes they should work with your MacBook!
A:AnswerTo answer your question you have to put the microphone in your mouth for you to hear yourself but I can hear my voice just fine without mic monitoring. I have heard people say there side volume is locked at 25% but it seems they just need to reinstall drivers for it.
A:AnswerNot sure if you have purchase a new headset but I would recommend CORSAIR - Gaming VOID PRO RGB USB Wired Dolby 7.1 Surround Sound Gaming Headset - Carbon black. I use it for daily meetings and LOVE them.
A:AnswerTo be honest if you're out of storage space you shouldn't be buying light up peripherals. You should invest in a new or second storage drive or think about getting a new computer. Solid state drive prices are really low now or you can get a giant hard drive for ultra cheap as well.
Good luck!
A:AnswerThey don't have a batter they are powered by the USB cable. So to answer your question yes, they are just plug in and will continue to work as long as you want.