Perfect

I love this power bank! It's a good size, and holds many charges for my phone. When I went on a weeklong vacation I just took this instead of worrying about an adaptor for my charger. It has 2 inputs for charging it quickly, and 3 outputs for charging different devices simultaneously. I recommend.

You have to buy this battery pack!

I bought the powercore from a major retailer at an airport on sale about a year ago. The 20000 model was $20 more than the lesser models, so I went for it at $70 (on sale). They've since come down in price. I've never regretted the decision. I can charge my cell phone (Note 8) up to 4 times before having to re-charge the powercore. You can even leave the powercore untouched for days/weeks and there is still charge left. I haven't tried charging other devices, only cell phones. I highly recommend this product.