1 Flexible high quality noise canceling microphone to reduce background noise 2 Acoustic Shock Protection circuit 3 Lightweight, durable and comfortable for all day use 4 Hearing on one side and can be worn on either ear 5 Adjustable headband 6 Replaceable soft foam or soft leatherette ear pad 7 Quick disconnect cord for the convenience of walking away without removing the headset Driver Unit 1 x 30mm Frequency Response 20-20kHz Impedance 150 ohm Sensitivity 125dB Max input power 10mW Plug RJ 10/RJ11/2.5mm Cord Length 1.8m coil cable