Coocheer Compact Car Jump Starter (2) Supports 12V vehicle jump start and charges most electronics, including: cell phone, PSP, MP3/MP4 players, PAD, Notebooks, car refrigerators, etc Emergency hand generator charges battery USB power source to operate and recharge portable electronic devices Able to charge multiple devices at once and can cycle up to 500 times Overload and short circuit protection, as well as jumper cable safety switch