Please check volume on your audio device to make sure it is outputting sound
If you use in-line please make sure that the 3.5mm plug is fully inserted into your audio device and headset. And please make sure the headphone plug and audio device’s jack sticks are clean
If TOUCHit On-ear / SACKit Touch 250 is used wirelessly and still is not playing music, you manually have to choose to play from TOUCHit On-ear / SACKit Touch 250 in your device settings. Please refer to the instruction of your device or specific app for further information