1,we have 4 styles 27W, 13.5W, 7W, 3.5W. 2.This is a green energy , the appearance are beautiful and wear-resistant Solar panel charger for Iphone IpadUsing high-efficiency monocrystalline silicon and polycrystalline silicon, solar energy conversion efficiency up to 17%. As below have 4 styles 27W, 13.5W, 7W, 3.5W.1, 3.5W USB Output : 5V (3.5W). For mobile phones , Iphone, digital cameras , MP3, ...