I suggest that your video should show how the JUN speaker works. Because it is a project and not an item on shop, showing how it can connect with a bluetooth device, and recording the sounds it plays would be very helping in customers make the purchase decision. That's the most important thing to show in the video.
I'd also suggest highlighting these features and instructions in the story section of your project. People want to know a) why your bluetooth speaker is different from others out there, b) if it's easy and intuitive to use, c) why you chose to use concrete, d) how is the sound quality, etc. things like that.
The simple ideas is the hard material to reflect and smooth surface will enhances great sound performance. that why we use the the concrete material. The concrete has been developed over several months of process.
How to use?
you can open/close system by hidden switch on bottom case and recharging battery by USB cable with rechargeable hole.