EPOS (Sennheiser) 508349 Designed for exact compatibility with EPOS (Sennheiser) product, EPOS (Sennheiser) accessories ensure maximum performance, longevity and ultimate cost-effectiveness. EPOS (Sennheiser) accessories are an integral part of the fundamental design of its main products, combining with other key elements of their design to deliver optimum durability, reliability and quality.