SLX 1 - Bodypack Transmitter The reliable SLX1 wireless bodypack transmitter is designed to hold up to the most adverse conditions. SLX1 can be used in a variety of SLX Wireless systems, including Lavalier, Headworn, Guitar/Bass, Instrument, and Combo. Automatic Transmitter Setup Backlit LCD with timeout feature Frequency and power lockout 3-segment battery fuel gauge 2