The Heil Pro Set 3 is a professional-quality headphone set that provides excellent audio clarity, frequency response, and balance. The Pro Set 3 features a phase reversal switch that runs the speakers out of phase when engaged. This unique feature reduces listener fatigue during long sessions and helps live sound engineers accurately monitor signals in loud and noisy environments. The Pro Set 3 is perfect for monitoring audio for podcast, recording, front-of-house and monitor live sound, and broadcast.Specifications:Terminates in a 1/8″ plug and comes with a 1/8″ to 1/4″ adapterType: Closed-back dynamicDriver Diameter: 40 mmMagnet: NeodymiumFrequency Response: 10 Hz 22 KHzMaximum Input: 1,000 mWSensitivity: 102 dBImpedance: 32 ohmsWeight: 198 g (7 oz)