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Folding Solar Charger Guide:
All models include a power bank to store the sun's energy and are made with the same high quality materials. The difference in the models is the power rating in watts. The higher the number, the more sunlight is converted to electricity during a given time period. While all the models will charge your devices under good conditions, the higher wattage models are more effective and quicker charging multiple devices and in less than optimal conditions. The Helios Mini 7 watt is very small and light weight with a single USB port. The full size Helios chargers have dual USB ports and are available in 15 watt, 21 watt, and 28 watt models.