Wired:Make sure the battery is not in the Microphone. And plug the cord to the microphone and your audio amplifierSwitch microphone to MIC position and start to singWireless:Install batteries into both microphone and receiver. Switch on them the connection will be built easily. With LED indicatorSwitch microphone to ON position and start to singSwitch microphone to MIC position when you need a short break. It won’t collect other voices to the microphoneIf it does not work normal. Use a screw to press the RESET hole on the receiverIf you don’t use it for long time. Please take batteries(not included)out to protect the microphone’s componentsFrequency range: FMFrequency response: 100Hz1000hzS/N ration: 60dBDirectivity: unidirectionalOperating voltage: DC 1.5VService areas: 8~20 MetersReception sensitivity: 30dB/uVWired sensitivity: 50dB3dB(0dB=1V/Pa)Impedance: 600 Note:A receiver can only be used with one microphone not with multiple microphones.You can not use 2 or more Microphones with the same color indicator at the same time!If two wireless microphones are used at the same time you must use them with one red and one green indicator and use them with both receivers turned on.