The iPhone 6S and iPhone 6S Plus are evolutions over their respective predecessors, featuring improved hardware specifications, including 3D Touch, a force-sensitive touchscreen; upgraded rear-facing and front-facing cameras; a faster processor; a new chassis made of a stronger alloy of aluminum; second-generation Touch ID; improved LTE and Wi-Fi connectivity; and a new rose gold finish in addition to the space gray, silver, and gold finishes found on the previous models, while maintaining an identical design. The devices ship with iOS 9 preinstalled.