This Cisco C3850-NM-4-10G 4 Port Network Expansion Module is a must-have for anyone looking to enhance their networking capabilities. The module comes from a reputable brand, Cisco, and is designed to work with 3850 switches, making it a perfect fit for those in need of an upgrade. The module offers four high-speed 10G ports, which allow for faster data transfer rates and better overall performance. Additionally, the manufacturer warranty ensures that you can rely on the product for at least a month after purchase. This module is perfect for those looking to take their networking to the next level and is a valuable addition to any setup.