Made by high quality Fireproof ABS PC, Aluminum alloy material. Input ports : Either android user or iOS user, only one cable can recharge and descharge your power bank. Built-in polymer battery has safe and stable charging capacity and high conversion rate. The build-in safe IC provides multiple protaction, such as overcharge, over current and short-circuit, etc. Press and hold power button until LED indicators blink, it starts charge your phone.