Full Details from Amazon.com : http://www.amazon.com/gp/product/B00OUK919M?tag=onigi-20

Kingston HyperX Impact Black 8GB Kit (2x4GB) 2133MHz DDR3L CL11 SODIMM 1.35V Notebook Memory

High-performance memory for gaming notebooks small form factor PCs and Steam Box systems
Low voltage setting at 135V for cooler and quieter computing
Slim and sleek new look compatible with ultra-thin notebooks
Easy to install - automatic overclocking plug-and-play functionality means no adjustments in BIOS needed
Reliable - 100-percent factory tested
Guaranteed - lifetime warranty free technical support