Sennheiser HDR 175 Wireless Headset (505582) is an over-ear wireless headphone designed for home entertainment use and works with the Sennheiser RS 175 system (sold separately). It offers a wireless range of up to 328 feet (line of sight) for flexible listening. Selectable virtual surround sound modes add depth and atmosphere to movies and TV shows. Its comfortable design and stable connection make it ideal for extended listening sessions.