This ZyXEL Unified Security Gateway is a powerful VPN Firewall device from Taiwan. It is built to support up to one device and is perfect for enterprise networking and servers. With its advanced features, you can be assured of top-notch security for your network. The device comes with a reliable AC adapter for easy power supply. The ZyWALL USG 20W model is highly recommended for users who prioritize security and reliability for their networking needs.