Use X1 extreme in fair condition, this item has a small dent at A-cover, please check pictures.

Everything is tested working well. 

Processor 9th Generation Intel® Core™ i9 Processor Core i9-9880H 8 core 16 threads 2.3 GHz up to 4.8 GHz 16MB cache

Graphics Intel UHD Graphics 630 and NVIDIA GeForce GTX 1650 Ti Max-Q, 4GB GDDR5 memory;
supports external digital monitor via HDMI or Thunderbolt;
supports four independent displays;
Max resolution: 5K@60Hz (Thunderbolt); 4K@60Hz (HDMI)

Memory: 64GB(2x32GB) DDR4-2666 non-ECC, 64GB max dual-channel capable, 2 DDR4 SO-DIMM sockets

Display: UHD (3840x2160) Dolby Vision HDR IPS Anti-glare 500 nits 16:9 1200:1 100% Adobe 170°

Non-Touchscreen

Storage: 1TB M.2 SSD / PCIe NVMe, PCIe 3.0 x 4, 32Gb/s, please check picture for SSD status. Support Up to 2 M.2 2280 single side drives

Card Reader 4-in-1 reader (MMC, SD, SDHC, SDXC), supports UHS-II SD card

Audio HD Audio, Realtek ALC3286 codec / stereo speakers, 2W x 2, Dolby Audio Premium / dual array microphone (for special bid model, microphone is optional), headphone / microphone combo jack, Dolby Atmos headphone

Camera HD720p camera with ThinkShutter camera privacy, fixed focus

Native Intel Ethernet Connection I219-LM (vPro)) via optional ThinkPad Ethernet Extension Cable (Not included)
WLAN + Bluetooth™ Intel Wi-Fi 6 AX200, Wi-Fi 2x2 802.11ax + Bluetooth 5.1

Ports: 
Two USB 3.1 Gen 1 (one Always On),
two USB 3.1 Type-C Gen 2 / Thunderbolt 3 (with the function of Power Delivery
and DisplayPort), HDMI 2.0, Ethernet extension connector,
headphone / microphone combo jack, optional smart card reader,
SD card reader, security keyhole

Keyboard: 6-row, spill-resistant, multimedia Fn keys, LED backlight
UltraNav™ TrackPoint pointing device and buttonless glass surface multi-touch touchpad
Fingerprint reader: Touch style match on chip fingerprint reader on the keyboard bezel

Dimensions: WxDxH: 14.24" x 9.67" x 0.72"; 361.8mm x 245.7mm x 18.4mm
Weight: starting at 3.76 lb / 1.7 kg;

Battery Integrated Li-ion 80Wh battery, supports Rapid Charge (charge up to 80% in 1hr) 

AC adapter: 135W slim tip AC adapter

Preload Windows 11 Pro 64