Turn over the Bluetooth printer or scanner and make it discoverable. The way in which to make the Bluetooth printer or scanner discoverable is dependent upon the device. To find out how to make the Bluetooth printer or scanner discoverable, check the device's documentation or stop by the manufacturer's https://www.bluetoothspeaker.top/smart-wireless-subwoofer-loudspeaker-audio-system-sound-outdoor-rechargeable-speaker/