The Shure SLX24/SM58-J3 Handheld Wireless Microphone System combines an SLX2/SM58 handheld microphone/transmitter with the Shure SLX4 diversity receiver. SLX Wireless Systems are wireless tools and can be set up quickly. Great for installed sound applications and working bands, this Shure SLX wireless system offers up Shure's patented Audio Reference Companding technology along with a setup complete with automatic synchronization and suppport for up to 20 compatible systems (area dependent). Included with the SLX24/SM58, is the classic cardioid dynamic microphone with a built-in transmitter. Simplified set up operation allows you to enjoy automatic frequency scanning.