This wireless mic system was designed with the professional in mind. Class A solid state electronics are engineered for low noise, distortion and coloration. Features include exceptional Frequency Range, Audio Frequency Response and Output Levels. This professional UHF Dual Channel Wireless Microphone System comes with 1 handheld wireless microphone and 1 headset/lavalier microphone with body-pack transmitter. ThePDWM3500 also comes with independent volume control for each microphone and the frequency is adjustable for adding more mics. Uses 1/4'' jack outputs (XLR Balanced Outputs & Mix Output). Two 1.5V AA batteries included. DC 12-17 Volt Input 110-240 V. Microphone frequency between 614 and 698. Rack mountable UHF system makes communicating easy in the work-place and at large events.