SunTrack Technology is what makes this solar charger a stand-out and a must-have. It will power off when you’re in the shade and automatically reconnect your device when you’re back in the sun. It has been specifically developed to properly charge Apple devices, however, it will work flawlessly with other USB devices. The Solar Charger 18-Watt will charge a phone in 1 1/2 hours and a tablet in 5 hours. It folds down to a compact size for easy carry and has a clip so you can attach it anywhere.