Thoroughly inspected by Toby.
Note: this RAM module only fits in Windows and Linux laptops. This RAM is not suitable for a Mac desktop or laptop. The computer has to have a DDR4 connector. In order to check this, go to Windows Task Manager, 'More Details', under the 'Performance' header. Under 'Memory', it shows DDR3 or DDR4. In case there's no information about the connector, you'll need a DDR4.
With the Crucial 4GB SODIMM DDR4-2400 1 x 4GB, you can expand the RAM of your Windows or Linux-based laptop with 4GB. It's distributed over 1 RAM module of 4GB and has a clock speed of 2400MHz.