Application: Public address, on-stage monitoring Qty:1pcsIncluding wireless transmitter and receiver Stereo audio transmission Adjustable UHF radio frequency for interference-free reception Powered by 2pcs AA batteries (not included) Low power consumption circuitry Power switch with volume control for ease of operation Multiple sets of receivers can operate with a single transmitterSpecification:Carrier Frequency: 432.6MHz-434MHz Frequency Response: 50Hz-17kHz S/N Ratio: ?45dB Power: ?10mW Transmitter Power Supply: DC 12V/300mA Receiver Power Supply: 2 x 1.5V AA Alkaline Battery Receiver Operating Current: 50mA±20mA Channel Separation: ?30dB Operating Range: Approx. 30mPackage include:3x Receiver 1x Transmitter 3x Earphones 1x 6.3mm adaptor1x Audio cable 1x 12V/300mA adaptor 1x Use manual