Turn on the Bluetooth printer or scanner and make it discoverable. The way to make the Bluetooth printer or scanner discoverable is determined by the device. To find out how to make the Bluetooth printer or scanner discoverable, check the device's documentation or pay a visit to the manufacturer's https://www.bluetoothspeaker.top/audio-system-sound-big-bass-music-party-speaker-active-boom-hifi-box-wireless-bluetooth-speaker/