The Goal Zero Yeti 3000X Solar Kit With Boulder 200 Briefcase is a back up power source with solar panels to help charge it up. No more smelly gas generator, peace of mind in case the power goes out, while also serving as an option out at the campsite, cabin or an off-grid party. The roll cart is included, so no need to break your back situating it in just the right spot. Charge it via the wall or hook up the included Boulder 200 Briefcase solar panels and let the sun do its thing. A whole bunch of ports for a variety of output options from powering your tiny smartphone and even up to a full size fridge.