Riedel RUN-E1R XLR4F Lightweight Sports Headset (RHS)Riedel RUN E1 (XLR4F) is an ultra lightweight, 1 ear professional headset that has been optimized for demanding, high noise environments such as sports, security and events. Headsets should be durable, lightweight, small, comfortable, and easy to clean and maintain. All Riedel intercom headsets combine optimal audio quality with absolute reliability and are compatible with radios, belt packs and intercom control panels from other manufacturers.