The durable BLX88 offers simple setup, intuitive controls and microprocessor-controlled internal antenna diversity. One-touch QuickScan frequency selection quickly locates the best open frequency in case of interference. For use with BLX Wireless Systems. XLR and 1/4 output connectors. Two-color audio status indicator LED.Red: Excessive audio levels (overload / clipping). BLX2/SM58 Handheld Transmitter with SM58 capsule. Featuring an integrated SM58 microphone cartridge, the BLX2/SM58 Handheld Wireless Microphone Transmitter delivers wireless audio with professional clarity and reliability. The BLX2/SM58 Handheld Wireless Microphone Transmitter works with BLX Wireless Systems.