Externally, this notebook has an integrated 720p FaceTime HD webcam, a thin, backlit "second generation" butterfly mechanism keyboard with an integrated "Touch Bar" with a touch-sensitive control that adapts for different applications and provides Touch ID login support in lieu of traditional function keys, and a gigantic "Force Touch" trackpad. Additionally, it has a high-resolution LED-backlit 13.3" widescreen 2560x1600 (227 ppi, 500 nits) "Retina" display, and a integrated battery that provides an Apple estimated 10 hours of runtime. This notebook is offered in either silver colored aluminum or a darker "Space Gray" colored aluminum housing (but not other colors) and weighs just a bit more than 3 pounds (1.37 kg). Connectivity includes 802.11ac Wi-Fi, Bluetooth 4.2, four "Thunderbolt 3" ports (USB-C connector), and a 3.5 mm headphone jack.