Luna PowerPro 8400 mAh Charger for Portable Devices You're a power player. You like having what you need when you need it and you hate having to wait. So when your smartphone starts to fade, you need a ready solution. Enter the Luna PowerPro. It charges a wide variety of devices when no other power source is available, and even charges some smartphones multiple times. Nowthat'swhat we call a power trip.