Tying to find the Bluetooth connectivity disconnected, I did reboot multiple times until finally I could do so. Like always following rebooting I could connect the sound to my Bluetooth device, but soon after shutting the device off and wanting to reconnect no sound arrived for the Bluetooth device. https://www.bluetoothspeaker.top/colors-led-light-bluetooth-speaker-mobile-phone-wireless-stereo-outdoor-waterproof-speaker/