Hyperjuice 100Wh External Battery for MacBooks/USB Devices - Silver (MBP1.5-100) Equipped with not one but two high power 12W (5V/2.4A max) USB ports to quick charge two iPads (or any two USB devices) at the fastest speed 4 level LED battery indicator Use HyperJuice Magic Box (sold separately) or Apple MagSafe Airline Adapter (discontinued) to connect HyperJuice to MacBook Industrial grade lithium ion cells (trusted by aviation, military and healthcare industries) rechargeable up to 1,000 times Built-in short circuit, overcharging and temperature protection Beautiful aluminum housing, laser engraved logo and all-white accessories to complement the Apple and MacBook look.