Individual Volume Control - LCD screen on meeting microphone - Carrier Frequency: 470-608 or 614-698 MHz (FCC range). On/Off Broadcasting Switch - Mobile Anti-Interference Cartridge - Selectable Channels: 200 channels per microphone. (2) LCD screens on receiver - Input Sensitivity: -12dB (80dB S/N) - S/Noise Ratio: =110dB. Frequency Stability: ?0.005% - IR SYNC UHF Selectable Wireless Microphone - Power supply:110V/220V. Working Distance: 50-100 Meters - 1/4" individual outputs, 1 XLR mixed balanced output - Battery requirement: 2 X 1.5V (AA size) The Pyle PDWM4700 is a wireless microphone system featuring a rack mountable UHF base unit and includes 4 wireless tabletop microphones. This system is the perfect for large conferences, public speaking engagements, and more. System working range 50-100 meters thanks to the mobile anti-interference cartridge. (2) LCD screens on the receiver help you to control and display system readout information. Each microphone has its own volume dial on the base unit so you can balance the vocals as desired. Comes with ¼’’ individual outputs & XLR mixed balanced output. 200 selectable channels per microphone, excellent frequency stability, ON/OFF broadcasting switch and plenty more features to provide you with an impressive wireless microphone system experience.