Smaller than the Power Amp 18, yet compact and functional, the Power Amp 3 is a great device to have with you every day. The Power Amp 3 is able to charge most phones to a full charge with its 3000mAh battery and 2.1A rapid charge capability. The Power Amp 3 also has an LED flashlight and is compact enough to fit in your pocket; actually, it fits nicely in the palm of your hand. I was able to charge both my Samsung S7 and an iPhone 7 using the provided USB cable and my own cable. The Power Amp 3 was especially useful while traveling on the train in NYC. The Power Amp 3 costs $29.99. Visit www.zagg.com for more information.