This is the Goal Zero Yeti 400 Lithium Battery pack. It has 300 watt seconds of power. Meaning you can power a 50 watt draw LED light for 6 hours. This is a longer lasting option than running D-Tap cables from a V-mount or Gold mount battery. Can plug directly in via AC cable. Fairly heavy. I have two solar panels as optional rental so if you are in daylight, you can charge via the sun on location. Please see Goal Zero website for more info. http://www.goalzero.com/p/442/goal-zero-yeti-400-lithium-portable-power-station-+-boulder-50-solar-panel-kit