All iPhone 6s models have a 4.7" (diagonal) widescreen pressure-sensitive "3D Touch" LED-backlit 1334x750 native resolution (326 ppi) "Retina HD" display with "IPS technology and a taptic engine,", dual cameras -- a rear 12 megapixel, 4K "iSight" camera with 1.22 micron pixels, an f/2.2 aperture, and support for simultaneous 4K video and 8 megapixel still photography as well as a front 5 megapixel, 720p "FaceTime" camera.
The iPhone 6s uses a 7000 series aluminum housing and is available in four metallic color options -- "silver," which has a white glass front and a silver colored back; "gold," which has a white glass front and a gold colored back; "space" gray, which has a black glass front and a medium toned gray back; and "rose gold," which has a white glass front and a pink-tinted gold colored back (pictured). It also packs a second generation "Touch ID" fingerprint sensor embedded in the "home" button.
The iPhone 6s is powered by a 64-bit 1.85 GHz "Apple A9" processor and has 2 GB of LPDDR3 RAM and 16 GB, 32 GB, 64 GB, or 128 GB of flash storage (16 GB and 64 GB options discontinued and 32 GB option introduced on September 7, 2016). It also supports 802.11a/b/g/n/ac Wi-Fi with MIMO, Bluetooth 4.2, LTE (4G), and NFC for Apple Pay. It has a bottom-mounted headphone jack and uses a "Lightning" port to connect to a Mac, PC, dock, or power adapter.