Forever Battery Bank KA710 Wind-up Portable & Rechargeable 5,000 mAh USB Battery Pack/Charger for Cell Phones and Other Mobile Devices High Capacity, 5000mAh; Add 3 full charges or 20 hours of talk time to iPhone 5 / 4S / 4 / 3GS, 2 full charges for Samsung Galaxy S3, or 200% + to most mobile phones' battery life 2-way charging: USB 5V DC (USB cable included) and Hand Crank Built-in super-bright 1 Watt LED Flashlight 4-LED battery strength indicator High-quality Lithium Polymer battery lasts 500+ charge cycles