When Dell released the XPS 15 9550, they also announced a Thunderbolt docking station to take advantage of the 9550’s Thunderbolt 3 port. Dell referred to it as the TB15. However, one does not simply purchase the TB15, it comes packaged with a power brick. The 450-AEVM is a TB15 packaged with a 240W power brick. A package with a 180W power brick also exists.