Is in all good perfect working condition.

Just new installed Macos High Sierra System.

macOS 10.13 High Sierra

Apple iMac A1311 21.5" Desktop, Intel Core i5 2.50GHz (Mid-2011) Specs

Display

• 21.5-inch (viewable) LED-backlit glossy widescreen TFT display with support for millions of colors
• Resolution: 1920 by 1080 pixels

Processor

• 2.5GHz quad-core Intel Core i5 with 6MB on-chip shared L3 cache

Memory

• 4GB (two 2GB) of 1333MHz DDR3 memory

Storage1

• 2.5 GHz
• 500GB (7200 rpm) hard drive

Graphics

• 2.5 GHz
• AMD Radeon HD 6750M 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 modes

Audio

• Built-in stereo speakers
• Two internal 17-watt high-efficiency amplifiers
• Headphone/optical digital audio output (minijack)
• Audio line in/optical digital audio input (minijack)
• Built-in microphone
• Support for Apple iPhone headset with microphone
• One Thunderbolt port
• Mini DisplayPort output with support for DVI, VGA, and dual-link DVI (adapters sold separately)
• One FireWire 800 port; 7 watts
• Four USB 2.0 ports
• SDXC card slot
• Slot-loading 8x SuperDrive with 4x double-layer burning (DVD±R DL/DVD±RW/CD-RW)
• Audio in/out
• 10/100/1000BASE-T Gigabit Ethernet (RJ-45 connector)
• IR receiver

Wireless

Wi-Fi

• 802.11n Wi-Fi wireless networking;2 IEEE 802.11a/b/g compatible Bluetooth
• Bluetooth 2.1 + EDR (Enhanced Data Rate) wireless technology

Size and Weight

• Height: 17.75 inches (45.1 cm)
• Width: 20.8 inches (52.8 cm)
• Depth: 7.42 inches (18.85 cm)
• Weight: 20.5 pounds (9.3 kg)

Electrical and Operating Requirements

• Line voltage: 100-240V AC
• Frequency: 50Hz to 60Hz, single phase
• Maximum continuous power: 205W