If you find that headset microphone has no sound after pair to a computer via USB port, please follow the steps below: 1. Make sure the headset and port are paired successfully(port display light is fixed blue) If pairing is not successful, please try the steps below: 1) Reset the headset (please refer to the reset section of the manual). 2) Unplug the port and plug it into another USB port. 2. After the headset and port are paired successfully, please follow the steps below: 1) Right-click the Speakers icon at the bottom right, then click "Open Sound settings". 2) Make sure that [port] has been selected as both the output and input device. Then close Settings. If there is still no sound, the microphone of the headset may be disabled or [port] is not set as the default device on your computer. 1) Right-click the Speakers icon at the bottom right, then click "Sound ". 2) Click "Recording"and "Playback", then set [port] as default device and make sure it is enabled. 3. Make sure apps have access to the microphone. If your microphone isn't detected, you may need to give your apps permission to use it. (Take windows 10 as example) 1) To let apps access the microphone, select Start, then select Settings> Privacy> Microphone. Select Change, then turn on Allow apps to access your microphone. 2) After allowing access to the microphone, you can choose which Microsoft Store apps can access these features under Choose which Microsoft Store apps can access your microphone, and give access to non-Microsoft-Store desktop apps by ensuring that the switch beneath Allow desktop apps to access your microphone is set to On. Package Contents: 1 x Bluetooth Headphones 1 x Type-C Charging Cable 1x User Manual 1x Charging Base 1x USB Dongle