The Shure BLX2/SM58 handheld transmitter gives you easy setup and operation and top-notch sound quality, courtesy of its integrated SM58 microphone capsule. The lightweight, tour-tough BLX2/SM58 sports Group and Channel selection buttons for quick, hassle-free frequency matching, while a 2-color LED keeps you status savvy. With up to 14 hours of operation on two AA batteries and transmission of up to 300 feet, the BLX2/SM58 is up for any gig.