1. Line length: 1.2 meters 2. Plug: 3.5mm 3. Speaker: 10mm 4. With ear line control 5. Frequency response range: 20 to 20000Hz 6. Line control function description: answer the phone, the volume increase and subtraction 7. Channel system: surround stereo sound 8. Power: 1-3MW 9. Wiring: TPE (demolition microphone) 10. Mi head sensitivity: -29dbfs