The difference between the two domains is completely legal. turtlebeach.com registered www.turtlebeach.com and turtlebeach.com couldn't think of anything turtlebeach.com could do with the name, so turtlebeach.com added a dot and made it co, which stands for country-specific. Turtlebeach.com still cannot be used as a domain name in another country without prefixing it with .co