Sennheiser EM-XSW1 Wireless Mic Receiver A-band 548-572 MHz XSW XS Wireless
Designed for use with Sennheiser XSW transmitter models SK-XSW, SKM 825-XSW, SKM 835-XSW, and SKM 865-XSW that operate on the A band only (548-572 MHz). Sennheiser XS Wireless Diversity Receiver EM-XSW1.