The reliable SLX1 wireless body pack transmitter is designed to hold up to the most adverse conditions. SLX1 can be used in a variety of SLX Wireless Systems, including lavalier, Headword, guitar/bass, instrument, and combo. Six Wireless Systems feature patented Audio Reference Commanding for crystal-clear sound beyond the limits of conventional wireless technology. Note: when purchasing separate wireless components, please match their frequency bands to ensure proper system operation.