Features: Advanced ETFE-Film Process: light transmittance95%, stable performance and self-cleaning. Monocrystalline Silicon Solar Panel: environmental friendly and high efficiency. Dual USB Output: faster and safer charging for two devices simultaneously. Superior Portability: compact dimensions and 2 hooks attach it to a backpack conveniently. Lightweight Slim Foldable Design: ensure it easily fits in your daypack. Reliable Safety: not a battery, keep you and your devices safe. Wide Applications: compatible for iPhone, tablets, MP4, power bank, etc.