Xtream H3B BlueTooth 3.0 DJ Headphones Black, Foldable, rotatable pivoting, 80HZ/20kHZ. The Adesso Xtream H3 features Bluetooth 3.0 wireless hands-free audio to go along with space saving foldable headphone design that stores and travels well. Powered by a 50mm Neodymium magnetic driver unit delivers powerful, accurate vibrations. Make flawless hands-free phone calls using the integrated microphone. Never run out of Battery with the iOS onscreen meter. To give you true flexibility, we have designed dual input via Bluetooth or via 3.5" stereo jacks allowing you to use all kinds of devices.