Novobeam NBP3000-2P Ultra-Compact Waterproof / Dustproof Portable USB External Battery Pack Charger / Power Bank, 3,000 mAh, Compatible with most Smartphones and other USB Powered Devices, 2-Pack (Black & Green 1 Each) High-capacity Lithium rechargeable & portable battery pack with a full power capacity of 3,000 mAh, enough to fully charge Apple iPhone 5s / 5 / 4 / 4s / 3G / 3Gs and other smartphones, more than once Ultra-compact & ultra-light design with a weight of less than 3 oz and measurements of only 4 X 1 X 1 inches, comparable to the size of a roll of mints, fits easily in a shirt pocket or a purse Built with unique Push-n-Seal technology ensures IP66 water-proof and dust-proof, ideal for both indoors and outdoors Virtually compatible with all smartphones including but not limited to the ones made by Apple, Samsung, HTC, Motorola, LG, Nokia, Blackberry & Sony Package includes Novobeam NBP3000 external battery pack, micro USB charging cable and instruction sheet, 18-month manufacturers warranty