If you don't have any volume with your Lü, please check this article
1. Master Volume: Using the keyboard remote, press the V+ key to turn up the Windows volume. Press the V- key to turn down the Windows volume. This controls the master volume of the system.
2. Enable and disable music and sound effect: In Lü's settings, you can enable and disable the music and the sound effects.
3. Projector volume: We recommend the projector sound to be at 18 for an optimal experience.
Using the projector remote control, press the volume buttons to adjust the projector sound level to 18.
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