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.System includes:BLX2 Handheld transmitter with BETA58 microphone cartridge.BLX4 Single channel wireless receiver with microprocessor-controlled internal antenna diversity.FeaturesFrequency Range: 614MHz-638MHzUp to 14 hours battery lifeIntegrated microphone capsule design, featuring PG58, SM58®, or Beta 58A® optionsLightweight, rugged constructionColor ID caps (available separately)The durable BLX4 features 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 ¼ inch output connectorsTwo-color audio status indicator LED - Green: Normal audio levels, Red: Excessive audio levels (overload / clipping)