The Cisco C921-4P is a Gigabit Ethernet security router that's part of the Cisco 900 Series ISR (Integrated Services Routers) family. It's designed for small businesses, branch offices, and retail environments.

Here are some features of the Cisco C921-4P: 

• Performance: Up to 150 Mbps routing throughput and NAT throughput
• Ports: Four Gigabit Ethernet LAN ports, one Gigabit Ethernet WAN port, and one USB 3.0 port
• Memory and storage: 2 GB DRAM and 2 GB flash memory
• Security: Secure Sockets Layer (SSL) VPN for secure remote access, hardware-accelerated DES, 3DES, AES 128, AES 192, and AES 256, Public-Key-Infrastructure (PKI) support, 50 IPsec tunnels, and Cisco Easy VPN client and server