A must-have for everyone! Valley Portable Power Station, Power Outdoors!CHOOSE Velway Portable Generator. This is REAL LIFE SAVER!Not every location has abundant sun. At night or when were parked in cloudy/rainy weather for a while, we have to be a bit more conservative about our power usage, thats where the Velway shines.It is a gas-free compact portable multipurpose solar generator/battery backup that integrates an outdoor portable battery pack and online UPS.It also has a Battery Management System (BMS); It provides short-circuit, overcharge, and overload protection, and is made of energy-saving and fire-proof ABS material.