Contains a 5,000 mAh Internal Battery: Outlast the day with an extra boost of power when you need it most. Compatible with MagSafe and More: The magnetic array on the snap+ juice pack mini wallet is compatible with MagSafe iPhones and any Qi-enabled smartphone, including Apple, Samsung, and Google phones. Built-in Card Holder: Wallet slot holds up to 3 cards, including driver's license, IDs, credit cards, bus passes, membership cards, and more Two Steps to Charge: Just attach to the back of your device and turn it on for power on demand. Accurate Placement: The magnetic array on the snap+ juice pack mini wallet array ensures charging begins on contact, so you get the perfect charge every time.