Sony MDRZX770BT Bluetooth Stereo Headset (Black) Bluetooth audio streaming with AAC and aptX support, Convenient One-touch pairing with NFC, Built-in microphone for hands-free phone calling Rechargeable battery for up to 17hrs music playback, 40mm drivers for wide frequency response, Beat Response Control for tight bass/transient response Comfortable, swiveling, around the ear design, USB charging cable supplied, Available in Blue or Black Connectivity technology : Bluetooth