4GB, 1600MHz, PC3L-12800 DDR3L DIMM memory module
HP 691740-001, 4 GB, 1 x 4 GB, DDR3, 1600 MHz, 204-pin SO-DIMM
HP 691740-001. Component for: Laptop, Internal memory: 4 GB, Memory layout (modules x size): 1 x 4 GB, Internal memory type: DDR3, Memory speed: 1600 MHz, Memory form factor: 204-pin SO-DIMM