SBBB bluetooth speaker

It's a Small Box with Big Bass (at least that's what i want it to be...) https://youtu.be/05p6EjRsf4E Note : the microphone of the camera really doesn't do justice to the sound :-/ Features : True extra bass sound system with Xtra Long Pass (© XLP) passive radiator, doesn't sound as cool as it's name but not bad either class D amp between 10-15w rms 2x 18650 battery (should get 10 hours at reasonable level) What you have to put inside : SQ 251 4ohms speaker https://fr.aliexpress.com/item/4000540507550.html passive radiator 40*70 https://fr.aliexpress.com/item/4001014691399.html pam8610 with integrated bluetooth https://fr.aliexpress.com/item/32732590506.html dc step up that could handle 2A or more from ~4V input to 15V output The one in picture is pretty decent some capacitor to smooth current spike (I put 2200 + 3300 /25V at the amplifier voltage input and 2200 10V at the step-up input) one power button, one Led with it's resistor and 3 push button a USB plug,