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A. Sound control: The red ON, the knob adjusts the volume of the computer, -key mute, the song up/down song switch. C. Bluetooth-Compatible Transmit: When the green ON, long the MODE button to enter. Bluetooth-Compatible search, and the green light flashes quickly to automatically match around. B. 3.5mm audio output: Blue ON, wired earphone is inserted into AUX OUT hole, computer voice is output from earphone. Bluetooth-Compatible headset, Bluetooth-Compatible speaker and other devices, the green light is steady on after successful pairing.