Take out your own listening infrared headphones, make sure they are in good condition and can be used normally.

Prepare a pair of batteries. Different headphones need different battery sizes, some need No.7 and some need No.5. According to the choice of headphones, choose a good battery, identify the positive and negative poles and install the battery.

Press and hold the power button to start the machine, and it will enter FM mode by default. Press the power button twice to enter the infrared mode, and the display will show IR. The frequency of infrared broadcasting in the market is generally 2.3M/2.8M

Infrared headset button-ear pad rotates counterclockwise. When the crystal key is turned on, the upper side is 2.8M/ the lower side is 2.3M, which can be selected according to the frequency calibration.

After adjustment, you can adjust the appropriate volume according to your own needs. The volume button is generally under the power-on button. Turn off the headset in time after use, and take out the battery, so as to avoid being unusable next time.