Before purchasing, please ensure that the wireless frequency band you select works in your area. Includes BLX4 wireless receiver, BLX2/SM58 handheld transmitter with integrated SM58 cardioid dynamic microphone capsule, microphone clip, padded zipper case and user guide If you've ever heard someone sing or speak into a live microphone, there's an excellent chance it was an SM58. Rock stars. Pop idols. Comedians. Presidents. Popes. Immortal words have passed through its iconic grille for generations. And with engineering and durability that set the world standard, it's sure to keep turning up at legendary performances. 300 feet (91 m) operating range (line of sight) Quick & easy frequency matching Adjustable gain control Power and battery status LED When performance is set free from wires, it can go to exciting places. But noise and dropouts can stop it cold. BLX Wireless makes it simple to get great sound out of a dependable wireless system. And when you can go wireless without worry, you can perform without limits.