2 by pressing the power button for about 8 seconds until the green light (next to the volume buttons) starts to flash. Well made, comfortable and very reasonable when we purchased them. Quick and better alternative to the usual basic ropes he was using. Skip it. I supposed if I were an IT guru I might could have followed their list of recommended updates and so forth and it might have worked but due to deadline to return it and my lack of confidence in being able to follow their technical instructions I decided to cut my losses. Only downsides I can really say are that this thing is more than a bit heavy. I left the microphone out of the case for about 3 weeks now and it still have some smells to it. Overall I would say buy it, but in the size you normally would for an athletic shoe. If you work in an environment where your standing allday these are the shoes for you! These earbuds can be used in so many ways, I use them on playstation 4 I plug them into my controller directly avoiding having to wear bulky charged or plugged in headsets.