Logitech H600 Wireless Headset Headphones

Input impedance: 30 ohms sensitivity (headphone): 102db +/-3db sensitivity (microphone): -44dbv/pa +/- 3db frequency response (headset): 40hz - 10khz frequency response (microphone): 100hz - 6.5khz usb-a charging cable length: 1.22m connections: usb-a compatible (1.1, 2.0, 3.0)