I've tried several bluetooth speakers around the same price and this has the best and loudest sound out of all of them. By far. The speaker gets very loud without losing too much of the sound quality so it's great for small-ish parties at home or in your backyard. The bungee strap is really useful...
ProFill the room well
ProComes with a floatie!
ProDouble Up feature
ProBungee strap allows attaching the device to other objects