1 usb headphone with microphone and volume control 2 Easy USB Connection 3 High quality ear cushion provides extra comfort

 Digital Sound Usb headphone with microphone  for Computer USB-329, Volume Contol, Mic/SpK mute fuctions combination:

Key Features:

Volume Control Built in Microphone/Speaker Mute Function

Key Specifications: Speaker:40 mm Dynamic type
Impedance:32 ohms
Sensitivity:105dB±4dB
Frequency:50∼20000Hz
Max.Input Power:100mW
Cord length:(2.3M)±5%
Connector: USB2.0