This item Crucial RAM 4GB DDR4 2400 MHz CL17 Laptop Memory CT4G4SFS824A. Samsung 4GB DDR4 PC4-21300, 2666MHZ, 260 PIN SODIMM, 1.2V, CL 19 Laptop ram Memory Module. A-Tech 4GB DDR4 2400MHz SODIMM PC4-19200 Non-ECC CL17 1.2V 260-Pin SO-DIMM Laptop Notebook Computer RAM Memory Upgrade Module.
https://www.amazon.com/Crucial-Single-PC4-19200-SODIMM-260-Pin/dp/B019FRDKWI

