Shure BLX Wireless Systems combine professional-quality sound with simple setup and an intuitive interface for legendary audio performance right out of the box. Precision-built and available in a variety of configurations, it’s the most accessible way to own the stage.
Includes BLX1 bodypack transmitter, BLX4R rack mount receiver, guitar cable, single and dual rackmount kit, two 1/4 wave antennas, zipper bag, power supply, 2 AA batteries, and user guide.
Shure BLX Wireless Systems include a quick scan feature that searches for the optimal frequencies available in your area.
This Feature Provides clarity without interruptions in audio. BLX Systems come in 3 frequency bands in the US. These frequency bands are H9, H10, and J11. Please Refer to the link below to help you choose which model is right for your area.
https://www.shure.com/americas/support/tools/wireless-frequency-finder