cancelling headphones

AILIER Volume Control Headset for PC Laptop Skype 1 this product has been awarded two patent of practicality and updated technology, they are 200820044298.6 2 High density multi core bronze thread,effectively reduce the loss,single side incoming thread desiging,avoids rolling. 3 φ40mm phonation element for wide tessitura and bass beat.Using original packed materials. imported from japan. 4.Plug in standard 3.5mm audio jacks for speaker and microphone 5.seven colors:China's red, yellow, white ,gold ,blue ,dark blue ,green Specifications: Speaker Driver Diameter:40mm Sensitivity:106dB Frequency response:20-21,000HZ Impedance:32Ω Maximum output power:100mW Cord length:2.3m Plug:3.5mm stereoPackage include: ;