With this combo charging pack you will have the capacity to charge 3 devices with the 3 port USB charger, and 3 different types of devices with the jellyfish charger. They're compatible with USB, apple, android, samsung, and more devices. To use the charging block, simply plug the charging block into any wall and plug any USB device into the block. To use the Jellyfish, simply plug USB into a charging block and insert the appropriate charging cable from the Jellyfish into your device.