Maybe your device is temporary frozen and is unable to detect the headphones or reroute the sound to them. Try restarting the device or turning it off and back on, after a few seconds.
If the issue still persists, check out the other solutions.
Maybe your headphones are turned off. All you have to do is to turn them on and your device should be able to recognize them.
Wireless headphones need batteries in order to work. If the battery is empty, the headphones won't work. If the battery is rechargable, make sure that it is fully charged. If the battery isn't rechargable, replace it.
If you are out of the transmitter's range, the headphones won't be able to reproduce the sound. Make sure to be as close as possible to the transmitter and that the transmitted is not too close to other electronic devices.
Maybe the headphones transceiver is temporarily unable to pair with the device. Try turning off your headphones and turning them back on after a minute or two.
If the transmitter of the wireless headphones needs adapter to work, make sure that the transmitter's adapter is plugged in to a power outlet. There should be an indicator on the transmitter which signals when the transmitter is turned on and its adapter plugged in.
By disabling the Bluetooth feature and enabling it after a few minutes, you should resolve the conflict the Bluetooth feature had.
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