HP L10598-855 is a laptop memory module for adding or replacing system memory in a supported configuration. HP identifies this exact part number as a 4 GB DDR4 SODIMM module.
It is specified for 2666 MHz operation at 1.2 V. The SODIMM format is intended for laptop memory slots, while the capacity provides an additional memory module for a compatible system. HP’s service guide lists the part for memory upgrades in the configurations it covers.