The W820BT wireless headphones with a modern design in black. The headphones feature 40mm NdFeb transducers and support for Bluetooth 4.1 technology with CSR. The built-in dual battery provides up to 80 hours of continuous operation on a single charge. The steel construction guarantees a long service life of the headphones. In addition, the W820BT features a built-in microphone and practical shell-mounted controls.