The Kingston KCS-D4000/16 module is specifically designed for use in CISCO 4000-M routers. With a capacity of 16MB, it provides additional memory to these routers, which can be essential for keeping them running smoothly. This module is easy to install and is designed to work seamlessly with CISCO routers to enhance their overall performance and functionality. Users can trust in its quality and durability, as it is manufactured by Kingston, a trusted brand in the world of computer hardware and accessories for over 30 years.