If you are looking for a battery pack to keep your smartphone or tablet charged up, then the Lumsing Harmonica-style battery pack is one you should check out. It's currently on sale for just $19.99 if you use the promo code 6KHOU6TT at check out. It's capacity is 10,400mAh, so it'll charge up your phone a couple of times before needing to be recharged itself.
The Lumsing Harmonica-style 10,400mAh battery pack also comes with two USB ports, so you are able to charge your smartphone and tablet at the same time. Definitely a nice addition here. You can pick this up from the link down below.