Model M471A2K43DB1-CTD. Pulled from a working system. Speed: 2666MHz / PC4-2666V. Capacity per Module: 16GB. Total Capacity: 16GB. Form Factor: 260-pin SO-DIMM / Laptop RAM. End of Life Recycling. Not compatible with DDR3, DDR5, desktop DIMM, RDIMM, or LRDIMM systems.