High performance headphones offers offers wireless music for your busy life. Wirelessly stream audio from a Bluetooth enabled device. Rechargeable battery with approximate 2 hour charge time. Auxiliary input plays non-Bluetooth devices. FM radio built-in. 40mm Speaker size. Hands-free mic makes it easy to take calls. Comfortable ear pads and padded headband. Rechargeable 3.7V 200mAh lithium battery. Up to 6 hour play time. Frequency response: 20Hz-20kHz. Includes Micro USB charging cable and Aux cable.