Call Center Headset, Bizoerade Hands-free Call Center Noise Cancelling Corded Monaural Headset Headphone with 4-Pin RJ9 Crystal Head and Mic Mircrophone for Desk Phone Call Center Phone 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. Noise canceling microphone to reduce background noise and Acoustic Shock Protection circuit to protect your hearing. 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