Schumachers 4200mAh Portable Charger with Built-In Cables Lithium Ion technology provides longer life. Designed with overcurrent, overload, under voltage and short-circuit protection. 2A & 1A Dual USB Ports charges most USB devices, including smartphones and mp3 players, cameras, wireless headphones and portable gaming systems. Ultra-compact and durable aluminum case is designed for durability and performance. The compact design will conveniently fit in your pocket, for easy traveling. LED Indicator provides charging status. Extend your phone battery life for up to 48 hours and give tablets up to 50% extra battery life.