SO-DIMM DDR4
From Amazon
Transcend 16 GB JetRAM DDR4 2666Mhz SO-DIMM 2Rx8 1Gx8 CL19 1.2 V
Conrad Electronic
Transcend JetRAM Laptop RAM card DDR4 16 GB 1 x 16 GB Non-ECC 2666 MHz 260-pin SO-DIMM CL19 JM2666HSB-16G
Clove Technology
Transcend JetRam DDR4-2666 SO-DIMM 16GB