Improving on the iPhone 6, the 6s has an A9 chip with an embedded M9 motion coprocessor and welcomes the addition of the 3D touch feature. It also features a 4.7 inch Retina HD display with a screen resolution of 1334x750 pixels and a touch ID fingerprint sensor. The quality rear-facing camera offers 12 megapixels with 5x digital zoom, autofocus, live photos with stabilisation and face detection, while the front-facing FaceTime HD camera offers 5-megapixel photos and 720p HD video recording. Use ApplePay for convenience on the go and Wi-Fi calling to save on minutes. Siri is included for easy messages, reminders and more using voice commands.