Appliance only! The WATCHGUARD XTM 5 Series Firewall Network Security Appliance is a powerful firewall device designed for network security. compatible with various operating systems including Windows and Android, this firewall offers protection for an unlimited number of devices. It has a minimum RAM of 4 GB and a minimum processor speed of 66 MHz, making it suitable for medium to large networks. The unit comes with rack ears for easy installation and measures 17" in length, 11" in height, and 1.75" in width.