Grape Solar Stone 5,200mAh Rechargeable Lithium Portable Battery Pack for Cell Phones, Smartphones and Other Portable Electronics Solar Compatible 5200mAh Lithium-Ion Battery Patented Auto-On/Auto-Off feature to maximize battery life 1 micro-USB input, 1 USB Output, 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.