HyperJuice 2 External Battery Pack for MacBook / iPad / iPhone / Smartphones - MBP2-100 The World's Most Advanced Battery for MacBook, iPad, iPhone and USB Powers a MacBook and 2 iPads (or any 2 USB devices) at the same time! OLED screen provides detailed battery information like percentage power remaining, temperature, time to full charge and discharge Compatible with all models of Apple MacBook / MacBook Pro / MacBook Air For battery to work with MacBook, you need Do-it-Yourself Magic Box kit. Is required in order to use this product with your MacBook (Sold separately) Military grade lithium ion cells, rechargeable up to 1,000 times