DARPA revealed upgrades to its Atlas robot on January 20, 2015. The robot was redesigned for DARPA by Boston Dynamics, with the goal of improving power efficiency to better support battery operation. Approximately 75 percent of the robot was rebuilt; only the lower legs and feet were carried over from the original design. The upgraded robot will be used by up to seven teams competing in the DARPA Robotics Challenge Finals, which will take place June 5-6, 2015, at Fairplex in Pomona, Calif. Admission to the event is free and open to the public.