Just plug directly into your headset-ready telephone! You just simply plug this modular plug into the headset jack on your telephone and it's ready to be used. Adjustable with noise cancellation technology microphone improves voice clarity. 1 Year Manufacturer Warranty. comfortable wear, compact appearance, human engineering design, Can be uninterruptible using. 150ohms speaker, to ensure the perfect voice quality; Noise proof microphone, to increase the voice clarity Compatible for most telephones in a call center The headset clip can be stretched freely and comfortable wear