Pioneer DDJ-FLX4 Instruction Manual page 38

• When using the unit with a USB power adapter or mobile battery
connected to the USB port (for power supply), make sure it has a
maximum voltage of 24V or less and DC 9V 3A.
Use a USB cable certified to the appropriate standard.
Use a mobile battery without a power-saving function.
• The [MIC] input terminal only supports an unbalanced input.
When not using the microphone, turn the [MIC LEVEL] knob to the
minimum level.
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Connections