Shure SLXD24DE/SM58 K59, 2-Channel Digital UHF Wireless System, Comprises one SLXD4DE double receiver and two SLXD2 handheld transmitters, Frequency range K59: 606 - 650 MHz, Handheld transmitter with dynamic SM58 microphone capsule, Polar pattern: Cardioid, Frequency range: 50 - 15,000 Hz, 24 Bit / 48 kHz audio transmission, 120 dB dynamic range, 44 MHz switching bandwidth, Switchable transmission power: 1 mW / 10 mW, 12 Compatible channels per 8 MHz band, Frequency transmission via infrared interface, XLR/Jack output, Transmitter operation with 1.5 V AA batteries, Matching Li-Ion battery SB903: Article no. #499632# (not included), 19"" Mounting hardware included