I would expect the Anker speaker to be worth the money. Amazon is a major seller of Anker products; I have a few of their battery banks and USB charger stations. They know battery management well, so a BT speaker that can play for 24 hours ought to hang in there even longer if connected to a Dot and used just periodically. I looked at Amazon; they come in black, blue and red and there are even larger and smaller models.