The Cisco QSFP-100G-ER4L-S is a high-quality 100GBASE ER4 LC SMF switch module designed for enterprise networking. Made by Cisco, a trusted brand in the industry, this unit ensures reliable performance for your network infrastructure. Its QSFP28-1000-ER4L-S network ports provide fast and efficient data transmission over a 40km distance, making it ideal for demanding networking applications. With a hologram for authenticity, you can trust that this module is a genuine product from Cisco.