Deviation range:50KHz S/N Ratio:105dB T. Output level balanced:0-400mv, unbalanceed:0-300mv Power supply:external DC power supply 0.4A, 1215V DC Package included: 1x set of Wireless Microphone System 1x User manual. International buyers please note: a.The item "Professional 4 Channel UHF Wireless Microphone System Mic with Headset KTV" is in sale since Friday, December 15, 2017. This item is in the category "Musical Instruments\Pro Audio\Microphones & Wireless Systems". The seller is "ellieshang" and is located in HK. This item can be shipped worldwide.