ADATA 4GB DDR4 2133MHz SO-DIMM Laptop Memory 

Part Number: AD4S2133W4G15-B 

New generation DDR4 performance
Greater computing power and efficiency with a
superb cost-performance ratio
2133MHz frequency at just 1.2V
Strict compliance with JEDEC standards
Rigorous quality assurance and testing
Optimized for the latest Intel processors
In 4GB densities