Quick and easy way to charge your Nano. Stand your Nano upright while charging prevents scratches and abrasions. Conveniently sync your Nano to any USB enabled computer. Line out function on back of dock serves as a space-saving stereo when connected to powered speakers. Thermal cooling design developed to ensure optimal heat dissipation while in use. A must-have accessory for your iPod Nano. Compatible with 1G / 2 G / 4G iPod Nanos. Micro Innovations Lifetime Limited Warranty