I wound up using the fast chargers that came with our phones to power the NANAMI units and am using that had been intended to use to power the NANAMI units as non-wireless chargers, which works out, but is not what was expected. Its big. To recharge them is easy with the case, no need to connect each one to a cable. I really enjoyed this product at first and still do but I’m not a fan of jar packing for my products. Not the reefs of yesteryear. The video was just to show the terrain I have taken it through. Im no audiophile, but Im certain this will do well for parties, the pool, skiing, picnics, etc. Althogh looks the right size, the stop for the foot is too far away from the top of the flip flop, and so there is a lot of space from the tip of your toe to the top of the flip flop, and subsequently theres no room left to accommodate your whole foot, you sort of step on the very edge or outside. Works great helps me sweat allot more specially in the area I need it the most . You can use the left earbud alone if you take the right earbud out of the case, connect it to the phone, and leave it in your pocket though.