WIRELESS SYSTEM: HANDHELD Professional wireless system for battery-operated dynamic and condenser microphones. Includes two transmitters and two receivers. Transmission in 2.4Ghz. 6 channels. Frequency response 20Hz-20Khz. Range 30m. 24 Bit A/D Conversion. Dynamic range 110 dB. Battery life: 5 hours. Lithium battery. Includes simultaneous dual charging USB cable for receiver and transmitter. It does not need a power supply. Colour: Black