The camera on one shirt sends video to the screen of the other and vice versa. The shirts are powered by 2190mAh lithium-ion battery pack that is stored in a belt you wear around your waist.

an Ellis’s Bullshifter t-shirt, the Original Portal t-shirt (which was actually on sale at the Valve store), and a Team Fortress 2 Sandvich t-shirt. “Undercover, the rules are different ...