Keep your mobile devices powered on the go with the black Sherpa 15 Power Bank with Micro-USB & USB Type-C Connector from GOAL ZERO. This bank features a 3870mAh capacity and 2.1 USB output for charging smartphones, tablets, wearables, and more. This GOAL ZERO power bank has a rechargeable LiPo battery that can be powered up in two ways. You can recharge the battery from the sun by connecting a compatible solar panel or using a standard wall charger. Furthermore, this power bank features a sleek and durable aluminum body, and its slim design easily slides into your pocket or backpack.