DDR3L-1600 SODIMM original 4 GB x2 Ram sticks for performance laptops
Total 8 GB These are SK Hynix / Korea branded. They are the original ram sticks that cames with Lenovo ThinkPad performance series 1.35 voltage (such as T440p or T540p etc). Also it works with many laptops that support 1.35v but also backwards compatible with the slower 1.5v laptops. Typicaly suitable for laptops released around******2014 give or take a few years before and after depending on brand. If you are unsure you could use this to findout what ram specification is suitable with your