Input Impedance: 22Ohms;Sensitivity (headphone):122 dB +/-3 dB;Sensitivity (microphone): -44dBV/PA +/- 2.5dB;Frequency response (Headset):20Hz to 20kHz;Frequency response (Microphone):100Hz to 6500Hz;Cord length:1.8m(5.9 ft)

Packaged Quantity:  1;Color:  graphite;Additional Features:b  Skype compatible, adjustable headband, noise canceling circuit;Type: b headset;Manufacturer: Logitech

Packaged Quantity:  1;Additional Features:  USB PC Link, noise canceling circuit;Type:  headset;Manufacturer: Logitech;Headphones Form Factor:  Supraaural;Sound Output Mode:  stereo;Frequency Response:  50 Hz

Driver: 31 mm diameter; Frequency response: ;Headset: 20 Hz – 20,000 Hz;Microphone: 100 Hz – 10,000 Hz;Sensitivity: -62 dBV/µBar; -42 dBV/Pa +/- 3 dB;Connection:USB;6-ft (1.8-m) cable

Packaged Quantity:1;Product Type: Earphones;Weight:0.42 oz;Color: purple splatter;Type:  headphones;Manufacturer:Logitech;Headphones Form Factor:  In-ear;Sound Output Mode:  stereo;Frequency Response: 20 Hz;Signal-To-Noise Ratio:  24 dB;Sensitivity :105dB/mW;Impedance:16Ohm

Sound Output Mode Stereo;Response Bandwidth -19980.0 Hz;Sensitivity 106.0 dB;Impedance 32.0 Ohm;Diaphragm 1.6 in;Connect Type 1.0 x Headphones (Mini-phone stereo 3.5mm)

40mm Neodymium magnet; Super cool sound, subwoofer, adjust the pressure to your ear.;Frequency: 20 to 20.000 Mhz;Impedance:32 Ohms;Sensitivity:100dB;Cable length:1.2m;Automatic noise reduction:12dB at 300MHz;With one AAA battery, can be heard continuously for 32 hours.

With a pair of soft silicone rubber to help the listener comfortable, easy resistant when used; Reduce noise;Size: 9mm; Length: 1m; 3.5mm Standard Jack