This is the Goal Zero Sherpa 120 power pack. It's lightweight, it's only four pounds. It's tough, durable, and it's also weather resistant. How durable? There's 12 bolts holding this bad boy together. I would recommend charging the Sherpa 120 with a Nomad 27. You can charge it depending on the weather, in about five to 10 hours. Or you can also charge the Sherpa 120 from a wall socket in about two hours. You can also charge the Sherpa 120 from 12 volt car adapter in about two hours. The Sherpa 120 is great for charging your small electronics through the USB port, like an iPad. The Sherpa 120 can charge an iPad had four to five times. Another great feature is a 12 volt output. You can use this included adapter to charge any 12 volt device. To power A/C devices like a laptop, you can use the Sherpa UI, or universal inverter. To connect the Sherpa UI to the battery, simply use the cord here. The Sherpa 120 is tough. It has these impact rubber feet for shock absorption. If you're looking for more power, simply stack two or more Sherpa Power Packs together and chain. With the included nylon webbing strap, you can secure the Sherpa 120 to just about anything. The Sherpa 120 has removable fuses for overload protection. The Sherpa 120 has an LCD screen that lets you see how much power is remaining in 20% increments. This is a unique feature for this type of battery.