Display

21.5-inch (diagonal) LED-backlit display with IPS technology

1920-by-1080 resolution with support for millions of colors

Processor

2.7GHz

2.7GHz quad-core Intel Core i5 processor (Turbo Boost up to 3.2GHz) with 6MB L3 cache

2.9GHz

2.9GHz quad-core Intel Core i5 processor (Turbo Boost up to 3.6GHz) with 6MB L3 cache

Configurable to 3.1GHz quad-core Intel Core i7 (Turbo Boost up to 3.9GHz).

Memory

8GB (two 4GB) of 1600MHz DDR3 memory

Configurable to 16GB.

Storage

2.7GHz

1TB (5400-rpm) hard drive

2.9GHz

1TB (5400-rpm) hard drive

Configurable to 1TB Fusion Drive.

Graphics

2.7GHz

NVIDIA GeForce GT 640M graphics processor with 512MB of GDDR5 memory

2.9GHz

NVIDIA GeForce GT 650M graphics processor with 512MB of GDDR5 memory

Video Support and Camera

FaceTime HD camera

Simultaneously supports full native resolution on the built-in display and up to a 30-inch display (2560 by 1600 pixels) on an external display

Support for extended desktop and video mirroring model

Audio

Stereo speakers

Dual microphones

Headphone port

Headphone/optical digital audio output (minijack)

Support for Apple iPhone headset with microphone

MacOS catalina works perfect and condition 10/10. Home used was imported from United Kingdom