Frequency Response 20HZ-20KHZ
Speaker ¢30mm
Impedance 32Ω
Rated Power 20mw
Power Capability 100mw
Cord Length 2.25m
Microphone 6x5-58?db
Connector Plug ¢3.5mm
The red for the microphone
The black for the earphone
http://www.lt158.com/product_show.asp?id=679