Apple iMac 21.5-inch (A1418, Late 2015) — Retina 4K IPS All-in-One Desktop. Intel Core i7  16 GB RAM 1 TB HDD, and Intel Iris Pro Graphics 6200 — 4K display

Display

• 21.5-inch Retina 4K IPS Display
• Resolution: 4096 × 2304
• Wide-color (P3) support
• LED-backlit, high-brightness panel
• Processor (CPU)
• Intel Core i7 (Quad-Core, 6th Generation “Broadwell”)
• Base frequency around 3.3 GHz, Turbo Boost up to approx. 3.8 GHz
• Excellent single-core performance for macOS applications
• Memory (RAM)
• 16GB LPDDR3 1867 MHz
• Soldered onboard (not user-upgradeable)
• Storage
• 1TB HDD, 2.5″ 5400rpm
• Supports hybrid Fusion Drive or SSD in certain configurations if upgraded
• Graphics
• Intel Iris Pro Graphics 6200
• Supports the 4K internal display & external displays via Thunderbolt

• Connectivity & Ports
• Wi-Fi 802.11ac, Bluetooth 4.0
• 2 × Thunderbolt 2 ports
• 4 × USB 3.0 ports
• SDXC card slot
• Gigabit Ethernet (RJ-45)
• 3.5mm headphone/optical audio out
• Audio & Camera
• Stereo speakers
• Dual microphones
• FaceTime HD webcam
• Design
• Slim aluminum unibody
• Built-in stand
• All-in-One desktop with all components integrated behind the 4K display
• Operating System
• Originally shipped with macOS 2015 version
• Supports later macOS updates compatible with the hardware