We have found this bluetooth speaker that can be used indoors and outdoors. We’ve tried it and we loved it.
It’s stereo, and it has “3D” sound, we don’t know very well what they mean by that but it sounds good.
It is sturdy and sturdy, doesn’t weigh too much and has a battery that lasts between 6 and 8 hours if you’re connected by bluetooth. You can take any backup battery than we use to charge your phone if you see that you’re going to need more time.