After you have plugged in your projector via the included power cord, you will need to open the Bluetooth settings on your device and select the option labeled "BTK10" (iPhone example below). This will automatically connect your device to the projector and you can begin using the built in speaker.
What if I don't see the option to connect to BTK10?
When powering on the projector, you should hear the message "Bluetooth is on" from the speaker. If you did not hear this message, you will need to either reset the bluetooth function by turning the projector off and back on, or by holding down the button on the back of the projector labeled BT off/on.If you did hear the message but still cannot locate the BTK10 option, we recommend restarting the device you wish to connect and checking again.