When plugged into a computer, it immediately works. Although it may be disappointing for music, it is great for human voices.

These headphones work really well. The audio is loud and clear. The only gripe I have is that the headphones get warm so I get hot while wearing them. Also, it kind of hurts my ears to wear them and I'm a petite Asian female. I usually only use them for about one hour meetings. However, it does what I need so I am okay with the disadvantages; esp since I don't use it for long periods of time. I would recommend trying something else if comfort is a must and if you will be using it a lot for extended periods of time.