This device was used exclusively in an office setting and is very clean.  The screen is bright with no dead pixels and the backlit keyboard pops!  Device was disassembled, cleaned, and reassembled with a NEW high capacity SSD, NEW RAM, and a NEW power adapter. The fan was cleaned from dust and depris and new thermal paste has been applied to the CPU which can get old and be less heat-conductive over time.  Please see my feedback and buy with confidence.

Processor (CPU)
CPU Name
Intel® Core™ i7-7600U CPU @ 2.80GHz
Threading
1 CPU - 2 Core - 4 Threads
Frequency
2593.66 MHz (26 * 99.76 MHz) - Uncore: 2194.6 MHz
Multiplier
Current: 26 / Min: 4 / Max: 39
Architecture
Kaby Lake-R / Stepping: B0 / Technology: 14 nm
CPUID / Ext.
6.E.9 / 6.8E
IA Extensions
MMX, SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, EM64T, VT-x, AES, AVX, AVX2, FMA3, TSX
Caches
L1D : 32 KB / L2 : 256 KB / L3 : 4096 KB
Caches Assoc.
L1D : 8-way / L2 : 4-way / L3 : 16-way
Microcode
Rev. 0xDE   ► Intel SA-00233 Patched ◄
TDP / Vcore
15 Watts / 0.839 Volts
Temperature
47 °C / 117 °F
Type
Retail (Stock Frequency : 2900 MHz)
Cores Frequencies
#00: 2593.66 MHz  #01: 2394.14 MHz 
Motherboard
Model
LENOVO 20HGS64W00
Socket
Socket 1515 FCBGA
North Bridge
Intel Kaby Lake rev 02
South Bridge
Intel Coffee Lake-U/Y PCH rev 21
BIOS
LENOVO N1WET49W (1.28 ) (07/04/2018)
Memory (RAM)
Total Size
16384 MB
Type
Dual Channel (128 bit) DDR4-SDRAM
Frequency
1064.1 MHz (DDR4-2128) - Ratio 3:32
Timings
15-15-15-35-2 (tCAS-tRCD-tRP-tRAS-tCR)
Slot #1 Module
Nanya Technology 8192 MB (DDR4-3200) - P/N: NT8GA64D88CX3S-JR
Graphic Card (GPU)
GPU Type
Microsoft Basic Display Adapter
GPU Brand
Lenovo
Storage (HDD/SSD)
Model #1 Name
SPCC M.2 PCIe SSD (FW: VC2S038D)
Model #1 Capacity
476.9 GiB (~510 GB)
Model #1 Type
Fixed, SSD - Bus: NVMe (17)
Miscellaneous
Windows Version
Microsoft Windows 11 (10.0) Professional 64-bit