Sennheiser XSW 1-ME3-A Wireless Headset Microphone System is a professional wireless headset solution designed for presenters, fitness instructors, stage performers, trainers, educators and live presentations. The system combines an EM-XSW 1 stationary receiver, SK-XSW bodypack transmitter and ME 3 cardioid headset microphone for hands-free performance and reliable wireless audio. It features antenna-switching diversity reception, integrated antennas, automatic frequency management and synchronization, with up to 10 compatible channels for flexible multi-system setups. The ME 3 headset uses a cardioid condenser microphone design for focused voice pickup and high feedback rejection.