Can’t find what you’re looking for? Try the following
Check your earbuds is charged.
Check your mobile device and the Denon Headphones app have been updated to the latest version.
Check your Bluetooth is connected.
Further Troubleshooting
Forget your earbuds from your device's Bluetooth settings, and pair again.
Reset the device which you are trying to connect to.
Delete and reinstall the Denon Headphones app.
Reset your earbuds.
Clean your earbuds.