Urge Basics 4000mAh Portable External Power Bank for Smartphones and Tablets Recharges most USB-powered devices Compatible with iPhone, iPod, iPad, Blackberry, Samsung, LG, HTC, Motorola, Droid, Kindle, Nook, most eReaders & Tablets Rubberized finish Rechargeable Lithium-Ion Battery Capacity: 4000mAh Output: 5V DC 1A