Turn to the Bluetooth printer or scanner and make it discoverable. The way in which to make the Bluetooth printer or scanner discoverable depends on the device. To learn how to make the Bluetooth printer or scanner discoverable, check the device's documentation or check out the manufacturer's website. In https://www.bluetoothspeaker.top/music-player-wireless-bluetooth-speaker-subwoofer-outdoor-plug-in-tws-portable-speaker/