You can connect to DDJ-FLX4 using a USB cable or Bluetooth.
For details, refer to the Instruction Manual of DDJ-FLX4.

• To connect using a USB cable

1. Connect a 9V 3A DC power supply to the USB port (for power supply) of DDJ-FLX4.
2. Connect the mobile device to the USB port (for device connection) of DDJ-FLX4 using a USB cable.
   *The sound is output from the MASTER output terminals and headphones output terminal of DDJ-FLX4.

• To connect using Bluetooth

1. Connect a 9V 3A DC power supply to the USB port (for power supply) of DDJ-FLX4.
2. Connect rekordbox for iOS with Bluetooth.
   *The sound is output from the mobile device.
   *There is a greater likelihood of experiencing audio latency compared to a USB connection.