The Sennheiser EM-XSW 1-B (article 507309) is the stationary receiver from the XS Wireless 1 series, operating in the B frequency range of 614 to 638 MHz. It is sold separately so it can be used to replace a receiver, or to build a system with a separate XS Wireless 1 handheld or bodypack transmitter. The receiver uses a double-superheterodyne design with antenna-switching diversity and integrated antennas, so there are no external antennas to fit. Setup is simple: automatic frequency management scans for a clean channel and a SYNC button pairs the transmitter via infrared, with up to 10 compatible channels available in one frequency bank. Audio leaves on a balanced XLR output (up to +12 dBu) and an unbalanced 6.3 mm jack (up to +6 dBu), with a switchable line/mic level. Audio frequency response is 50 to 16,000 Hz and signal-to-noise is at least 103 dB(A). XS Wireless 1 is aimed at singers, presenters, schools and houses of worship who need reliable, easy wireless. Check local frequency regulations before use.