The Shure BLX24R/B58 Vocal Rack-Mount Set features a dynamic transmitter engineered for producing precise accurate vocals. The Beta 58A microphone capsule delivers pristine vocal performances and includes a supercardioid pick-up pattern to isolate your sound from interfering noises. The BLX4R receiver has been designed for a quick setup with user friendly intuitive controls making operation easy. The One touch-QuickScan frequency selection system quickly locates the best open frequency to battle any potential interference and is compatible with up to 12 systems per frequency. Using the included rack mount kit the receiver can be professionally and easily installed for performance purposes.