Using your Incase Portable Power 5400 is a breeze. First, if you're using an Apple device with a Lightning connector, just plug the integrated Lightning cable into your device. For non - Apple devices, use an additional compatible connector. You can also connect multiple devices at once through the universal connect USB port. When the power bank runs out of juice, use the integrated USB - A cable to recharge it. Here are some things to keep in mind. Don't expose the power bank to extreme temperatures or moisture. Also, avoid overcharging it. To maintain your power bank, charge it regularly, even if you're not using it often. This will help keep the 5,400mAH internal battery in good condition. The LED power indicator will let you know the remaining power, so you can plan your charges accordingly.