Gear Head Wallet-Size Mobile Powerbank with Micro USB Charging Cable, Silver (PB1800SLV) 5000mAh capacity Dual USB charging ports Lithium-Polymer (Li-Pol) storage USB-to-micro charging cable Tablet & smartphone compatible 1800mAh Capacity Ultra Compact Size Lithium-Polymer (Li-Pol) Storage Technology USB-to-Micro Charging Cable Smartphone Compatible MP3 Player Support