Romoss 14000mAh High-Capacity Slim Power Juice Bank External Backup Battery with Charging Cable for MacBook Air 13.3" 1.86GHz Core 2 Duo (A1369) - MC503LL/A Capacity: 14000 mAh,3.7V/52Wh; MAX Input: DC 19V,3.5A (max) With three different voltage interface, it can charge for three devices at the same time. More secure:Multi-circuit protection system,away from the threat of over-current,over voltage,over temperature and over charge. Compatible with: MacBook Air 13.3" 1.86GHz Core 2 Duo (A1369) - MC503LL/A. Use your original USB charging cable, it can also charge iPad/iPhone/iPod/Tablet PCs/Smart Phones/PSP/MP3/MP5/Digital Camera and other USB powered device. How to Charge The Powerbank Itself? 8 male to female tips are included in the package, to charge the powerbank, please pair use the general laptop AC charger with tip size: 4.8*1.7mm/6.5*4.4mm/7.9*5.5mm/7.4*5.0mm/6.3*3.0mm/5.5*2.1mm/5.5*1.7mm/4.0*17mm tips. AC charger is not included. Note: Apple Macbook Air charger is not applicable.