Power Dome EX is a multi-purpose portable & rechargeable emergency power source. It can be used as a power source for 110volt AC or 12volt DC applications such as computers, TVs, fax machines, audio, fans, electrical tools, etc. It can also start your car engine in an emergency situation. Recommended to fully charge 24-36 hours before initial use, after each use and every 6 months. Safety Features: Overload protection, short circuit protection and UL listed.