A40 TR Headset for Xbox One & PC -- Play like a Pro! The ASTRO A40 TR is the premier gaming headset for professional gamers, including esports athletes, content creators, steamers, and game developers. Tuned for gaming Built to last. Less noise, more focus. Transducer Principle: Dynamic, Open 40mm Sound Driver tuned for Gaming Frequency Response: 20 - 20,000 Hz Nominal Impedance: 48 ohms Recommended Headphone Impedance: 32-48 Ohms Weight w/o Cable: 369g Connector: 3.5mm Mini-stereo and PC Splitter Boom Mic: 6.0mm Uni-directional.