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A-Tech 4GB Module for HP ProBook 4540s Laptop & Notebook Compatible Memory Ram
4GB Single DDR3L 2rx8 1.35v Non-ECC Memory Stick SO-DIMM Genuine A-Tech Brand Lifetime Warranty! Toll Free Technical Support Designed for maximum compatibility and easy installation in to your HP ProBook 4540s Works with your existing Samsung, Hynix, and Micron RAM modules of similar specs JEDEC standard 1.35V and 1.5V - This is a dual voltage module and can operate at 1.35V or 1.5V RAM 4 GB DDR3, Memory Speed 1600 MHz, Brand A-Tech, model number Computer Memory Type DDR3 SDRAM, Voltage 

Price is $36.00
Price: $36.29