Let's take a quick look at the OSVR HDK 2's specs and peripherals:

Head-mounted display (HMD) with dual OLED displays, 2160 x 1200 combined resolution (441 ppi), 90 Hz refresh rate

IR camera for 360º tracking, operating at 100 Hz

Belt box with surround sound audio codec and "signal boosters"

Decoding that name real quick, OSVR HDK 2 = Open Source Virtual Reality Hacker Development Kit version 2.