Wireless Bluetooth Microphone Button: 1.SOS Button 2.External Headphones 3.Group Switch
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Zello Bluetooth Mic Button: 1.PTT:Push to talk 2.Volume + 3.Volume -
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Zello Bluetooth Microphone with 3.5mm Jack B01 support Listen/Transmit,after connect 3.5mm earpiece,earpiece support listen only.
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