4/2016 Update…..since getting a new cell phone the volume on this tube is much lower. Just want people to know that depending on your phone and bluetooth capability, the sound might not be as good or very low.
This Boomtube is terrific! I used it at a baseball game for 6 year olds and they loved it! I purchased
Generic USB to 5.5 mm/2.1 mm 5 Volt DC Barrel Jack Power Cable and BiXPower Car Cigarette Female Socket to 5.5 x 2.5mm & 5.5 x 2.1mm Female Jack Adapter in order to use my Anker external battery as a source of power. This system of power worked great for those of you who want to use this Boomtube but don’t have an AC power source. The sound is loud. If you are looking for a system that allows you to adjust sound, this is not the product for you. The boys playing baseball loved the music being played in between innings. I am very happy with this product!