Processor: 2.0GHz Intel Core i7 (4th Gen, Haswell, quad-core)
Memory:  16GB of DDR3L RAM (1600 MHz)
Storage: 256GB SSD
Graphics: Intel Iris Pro Graphics
Display: 15.4" Retina Display, 2880 x 1800 Resolution
Connectivity: 802.11ac Wi-Fi, Bluetooth 4.0
Ports: 2 x USB 3.0, 2 x Thunderbolt 2, HDMI, SDXC Card Slot
Power: AC Adapter Included
OS: macOS Catalina (max)
Note: The "8GB/16GB RAM mix" suggests configurations with either 8GB or 16GB RAM.