AGPtEK Dual 3.5mm Audio Plug Call Center Binaural Headset Noise Cancelling Corded Headphone with Mic for Phone Desk Telephone 150ohms speaker, to ensure the perfect voice quality. Noise proof microphone, to increase the voice clarity. Comfortable wear, compact appearance, human engineering design, Can be uninterruptible using.The headset clip can be stretched freely and comfortable wear. Compatible for the most telephones in call center. It is 3.5mm headset. Superior quality sound with the flexible adjustable noise cancellation microphone. Just plug directly into your headset-ready telephone! You just simply plug this modular plug into the headset jack on your phone and it's ready to be used.