I am selling an original Samsung 4GB DDR4 laptop RAM module. It was pulled from a working laptop and is in excellent working condition. Specifications (from the label): Brand: Samsung Capacity: 4GB Type: DDR4 SODIMM (Laptop RAM) Speed: 2666MHz (PC4-2666V) Part Number: M471A5244CB0-CTD Voltage: 1.2V Made in: China Suitable for: Upgrading older laptops that currently have 4GB or 8GB of RAM. Adding a second stick to enable Dual-Channel memory (improves overall system speed). Reason for selling: Upgraded my laptop to a higher capacity stick.