Through February 14, get a lithium-polymer replacement battery at no charge with your purchase of an AR.Drone, the first quadricopter controlled by iPhone, iPod touch, and iPad. The AR.Drone combines the best of many worlds, including modeling, video gaming, and augmented reality. And its various sensors--a front camera, vertical camera, and ultrasound altimeter--make this groundbreaking device easy to pilot and land. Find more information on the product detail page.Expires Feb 15, 2011