5 V. The one thing I dont like about them is that they have a bit too much of a heel on them. This is good priced mic boom stand, it will function the way you want it to if you have the desk space. even while its cleaning ink head you can see the ink gauge is decreasing quite rapidly. Sara, recorded in 19881 allowed me to listen to digital from the early stages, and Champlins throaty soulful voice cut through and sound amazing. They are light weight, but comfortable. Ive bought and returned 3 phone bluetooth devices. The leopard pattern is outstanding and delights me. Worth the money for fit and gorgeous color, and my feet feel so great in them, like they are an old friend. [UPDATED]I cant explain what changed or why, but my initial issues with these buds just vanished.