Total Kit Capacity: 16GB Kit Quantity: 2 x 8GB Module Memory Type: DDR4 Form Factor: UDIMM Speed: 2666MHz PC4-21300 Rank: 1Rx8 ECC Type: Non-ECC Unbuffered Pin Count: 288-Pin Voltage: 1.2V Optimized for next generation processors and platforms Reduce power consumption by up to 40% and extend battery life Designed for Select DDR4 Compatible Laptop Computers: (not limited to) Acer, Alienware, Apple, ASRock, ASUS, Dell, DFI, Fujitsu, Gateway, Gigabyte, HP, HP Compaq, Intel, Lenovo, LG, MSI, Panasonic, QNAP, Samsung, Sony, Supermicro, & Toshiba Models. 30 day money back guarantee, lifetime warranty, and long lasting customer support