Compatible with iPhone 5/5S/5C/iPad Air/iPad Mini. The mass of the Gravitas has been optimized for single-handed docking & undocking by using the weight of the dock to overcome the force required to remove the device. Despite the impressive weight, the dock has a remarkably small footprint that is only about 3.5-inches (89 mm) in diameter & 2.5-inches (64 mm) tall, maximizing desk space. Henge Docks accomplished this sleek design by constructing the chassis from a metal alloy that is 265% denser than aluminum.