The Shure SLXD24/SM58 wireless system brings together the legendary SM58 microphone capsule with state-of-the-art wireless technology: Enjoy the familiar professional feel and convincing SM58 sound with absolutely reliable RF performance. Features Transparent 24-bit audio quality Absolutely reliable RF performance Use of up to 32 compatible channels per 44 MHz frequency band Up to 12 channels per 8 MHz band Easy set-up Up to 8 hours runtime with two AA batteries Frequency range: G59 (470 to 514 MHz) Includes SLXD4 1-channel receiver and SLXD2/58 handheld transmitter, antennas, rack-mounting accessories, and two AA batteries.