The black Sennheiser RS 220 Headband Wireless Headphones are engineered with the proprietary 2.4-GHz digital transmission technology for exceptional sound quality and a wider indoor coverage. Its padded headband and ear cushions ensure optimum comfort. This includes an oval-shaped circumaural cups that fit naturally with the shape of the ear. Equipped to provide a line of sight wireless range of almost 300 feet, these Sennheiser headphones ensure superior performance in any large sized indoor space. Setting up the headphones is easy as they are designed for plug and play.