Heralded as the "most advanced Mac ever built,"
the officially dubbed "MacBook Pro with Retina Display" models combine
a beautiful high-resolution LED-backlit 15.4" widescreen 2880x1800 (220 ppi) "retina" display with
a thin, sleek case design that weighs a bit less than 4.5 pounds (2.02 kg).

The Retina Display models also are an essentially "sealed" design with RAM that is soldered in place and cannot be upgraded after purchase, storage that is not intended to be upgraded after purchase, and a battery that cannot be replaced readily even by technical users or third-parties, either.

This particular model -- the MacBook Pro "Core i7" 2.3 15-Inch (Mid-2012 Retina Display) features
a 22 nm "Ivy Bridge" 2.3 GHz Intel "Core i7" processor (3615QM),
with four independent processor "cores" on a single silicon chip,
a 6 MB shared level 3 cache,
8 GB of onboard 1600 MHz DDR3L SDRAM,
256 GB of flash storage,
dual graphics processors
-- a NVIDIA GeForce GT 650M with 1 GB of dedicated GDDR5 memory and
-- an "integrated" Intel HD Graphics 4000 graphics processor that shares system memory, as well as
an integrated 720p FaceTime HD webcam.

It does not have an internal optical drive.

Connectivity includes
3-stream AirPort Extreme (802.11a/b/g/n),
Bluetooth 4.0,
two USB 3.0 ports,
two "Thunderbolt" ports,
an HDMI port,
an audio in/out port, and
an SDXC card slot.

It does not have Gigabit Ethernet or Firewire "800," although adapters are available at extra cost.

In addition, this model has
a backlit keyboard,
a "no button" glass "inertial" multi-touch trackpad,
a "MagSafe 2" power adapter, and
an internal, sealed battery.

Please note that stock images are used.