Shure BLX88 Dual Channel Wireless Receiver, H8 For this wireless system component to work, please make sure your transmitter and receiver match in frequency range (style) Up to 12 compatible systems per frequency band (region dependent); Microprocessor-controlled internal antenna diversity One-touch QuickScan frequency selection quickly locates the best frequency 1/4" and XLR audio outputs; Two color audio status indicator LED Make sure the frequencies match, then manually adjust the group and channel of the receiver and transmitter. The receiver and transmitter must be on the same group and channel to work together. Up to 12 compatible systems per frequency band (region dependent), plus One-touch QuickScan frequency selection quickly locates the best frequency. XLR and &#034; output connectors. Two-color audio status indicator LED (Green: Normal audio levels / Red:Excessive audio levels).