Turn over the Bluetooth printer or scanner and make it discoverable. The best way to make the Bluetooth printer or scanner discoverable will depend on the device. To learn how to make the Bluetooth printer or scanner discoverable, check the device's documentation or go to the manufacturer's website. Up https://www.bluetoothspeaker.top/wireless-bluetooth-speaker-clear-sound-bt-bass-3d-stereo-subwoofer/