HP 855843-R72 is an 8 GB laptop memory module for systems that use a 260-pin SO-DIMM. It adds memory capacity in a compact module format intended for laptop memory slots.
The module uses DDR4 memory and is listed at 2400 MHz. Its 260-pin SO-DIMM form factor distinguishes it from larger desktop DIMM modules. Check that your system accepts this memory type and module format before installation.
This part is identified as HP 855843-R72.