Smartphone Backup Battery (rechargable) - Ideal for travelers & professionals. Work with most new Smartphone - iPhone, Blackberry, HTC & Google phones. Credit card size external battery for iPhone, iPod , Blackbarry and HTC Smart Phone Quick power capacity check button Dedicate circuitry for battery safety and long life cycle Elegant design with great finish Powerful 1800 mAh Litium Polymer high capacity battery pack Made in Taiwan