Your Nebula Mars II / Mars II Pro can be used as a Bluetooth speaker after switching from Projector Mode to Bluetooth Speaker Mode. Just follow these steps:

1. Press the Bluetooth button on the top of your Mars II / Mars II Pro to change it to Bluetooth Speaker Mode.
2. Enable Bluetooth function on your smartphone and select Nebula.
3. Follow the on-screen instructions to complete Bluetooth connection

If you want to stop Bluetooth Speaker Mode, press the Bluetooth button on your projector once again to change back to Projector Mode.

If you have additional questions, please contact us for further assistance.