Astro 7785 Portable 650A Diesel Jump Starter/Power Supply with MacBook Power Cord Rechargeable, Convenient, and comes with home and car chargers Supports 12V vehicle jump start and charges most electronic including: cell phones, PSP, MP3/MP4, PDA, Notebooks, car refrigerators and more. Can cycle up to 1,000 times. Can power a MacBook up to 4 hours. Charges smart phone up to 12 times on a full battery.