The Sony MDRZX330BT are over-ear headband headphones. The frequency range covered by the model is 100Hz to 4000Hz. With 2.4 GHz frequency band, this pair of black headphones produces authentic sound. This wireless model offers Bluetooth and NFC connectivity and offers a transmission range of up to 30 ft. It has a built-in lithium-ion rechargeable battery that lasts up to 30 hours on a single charge.