The Palo Alto Networks® PA-500 Series Next-Generation firewalls include the PA-520, PA-540, PA-545-POE, PA-550, PA-555-POE, and PA-560. These firewalls are designed for small organizations or branch offices and include the following main features: a TPM module for PAN-OS key storage and security, ZTP functionality, Power Over Ethernet (PoE) support for select models, and active/passive and active/active high availability (HA). All PA-500 Series firewalls can make use of dual power adapters for load sharing and power redundancy (the second power adapter is sold separately). The PA-500 Series firewall enables you to secure your organization through advanced visibility and control of applications, users, and content.