Grape Solar Slate 11,000mAh Rechargeable Lithium Portable Battery Pack for Cell Phones, Smartphones and Other Portable Electronics Solar Compatible 11000mAh Lithium-Ion Battery Patented Auto-On/Auto-Off feature to maximize battery life 1 micro-USB input, 2 x 2 Amp USB Output for faster charging, recharges via included micro-USB cable 4 LED Charge indicator, Digital Charge/Discharge Management Your portable devices can be easily recharged via the USB charging cable provided by your device manufacturer.