In the league all teams use identical robots. Therefore, the teams concentrate on software development only, while still using state-of-the-art robots. The robots operate fully autonomously, i.e. there is no external control, neither by humans nor by computers. In 2008 the league goes through a transition from the four-legged Sony AIBO to the humanoid Aldebaran Nao.
For more information, please check the league's official wiki: http://wiki.robocup.org/wiki/Standard_Platform_League