high quality There are 3 modes of the 12 microphone: normal model, noise reduction mode and reverb mode. You may click the switch to select a mode. NOISE CANCELLING FOR FLAWLESS RECORDINGS. 12 wireless Lavalier Microphones record clean and clear voice. Used for Youtube Podcasting, GarageBand, or even to record your own rap!Pay attention to that : Only the receiver is plugged in your device , 12 microphone transmitter will automatically connect with the receiver. Then the blue light stops flashing off and on. You may adjust the mode of the microphone after the transmitter and the receiver connect with each other.There is a USB C charging port in the 12 receiver. When you broadcast, the microphone and your smartphone charger can work at the same time, you need not fear losing power on your phone1* 12 transmitter Microphones, 1* Receiver, 2* Foam windscreen,2*windscreen Muffs, 1* English User's Manual,1*carrying caseA As12 transmitter may work for about 4 hours. A receivers can connect with 2 transmitters at most. When the receiver was plugged in a smartphone, the transmitter will automatically connect with the receiver. 2 transmitters may support your live steaming to last for several hours