Used came out of a dell laptop. 
The SK Hynix 4GB DDR4 2400 MHz PC4-19200 1Rx16 Laptop RAM Module is a high-quality memory module designed for laptops. With a total capacity of 4GB and a bus speed of PC4-19200 (DDR4-2400), this module offers fast and efficient performance. The SO-DIMM form factor and 260 pins make it easy to install in various laptop models. Manufactured in China by SK Hynix, this RAM module is a reliable and dependable choice for enhancing your laptop's memory capacity.