The device looks a bit like a massively overgrown telephone headset, with overtones of a cycle helmet and maybe a gas mask thrown in.

BBC: Motorola unveils a computer that straps onto your head

Oviatt testified Monday that within minutes of the first calls, he responded to the theater and found Holmes standing outside in a helmet and gas mask, his hands atop a white coupe that turned out to belong to him.

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Then he donned a police-style helmet and body armor, tossed a gas canister into the theater crowd and opened fire, prosecutors said.

NPR: Colo. Judge Enters Not Guilty Plea For Holmes

Outside, the first officer to encounter Holmes -- who was still dressed in body armor, a helmet and a gas mask as he stood near his car -- described him as unnaturally relaxed.

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They also found high-capacity magazines, tear gas, a military-style helmet and 10 silencers.

CNN: Renegade ex-cop Dorner died from single gunshot to head

Along with the gas mask, the suspect wore a ballistic helmet, protective gear for his legs, throat and groin, and black gloves.

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Oates said the man was wearing a ballistic helmet and protective gear for his legs, throat and groin, black gloves and a gas mask.

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