Note: This RAM module only fits in Windows laptops. For a MacBook or iMac, this RAM isn't suitable. The laptop needs to have a DDR3 connector. You can check this in the Windows Task Manager by clicking 'More Details' under the 'Performance' header. It'll say DDR3 or DDR4 under memory. If it doesn't say anything about the connector, you'll need a DDR4.
The Kingston ValueRAM 4 GB SODIMM DDR3L-1600 is a single memory module for a Windows laptop. This RAM module has a clock speed of 1600MHz and comes with a lifetime warranty from Kingston.