Professional customer service headphone is perfectly suitable for for customer service, business and office. With noise reduction technology, it delivers stereo sound quality cutting off ambient noise during your work.<br><br><strong>Features:<br>[Clear Communication &amp; Noise Reduction]</strong><br>With noise reduction technology, it delivers stereo sound quality cutting off ambient noise for clear communication. <br><strong>[Hands-free Call]</strong><br>With adjustable microphone, hands-free function brings much convenient and enables you to improve working efficiency. <br><strong>[Adjustable Headband]</strong><br>Adjustable headband can be adjusted according to head size. You can rotate 360 degree for convenient wearing. <br><strong>[Adjustable Microphone]</strong><br>Adjustable microphone can bend for better communication. Independent switch button and volume button is for convenient and quick operation.<br><strong>[Application]</strong><br>Stereo customer service headphone is perfectly suitable for customer service, business and office, etc. <br><br><strong>Specification:</strong><br>Model: S400D<br>Mic: <br>Impedance: 2.2kohm<br>Frequency Response: 20-16,000Hz<br>Sensitivity: -47Db+-1Db<br>Speaker:<br>Distortion: 1% Max<br>Impedance: 150ohm+-10%<br>Item Size: Approx. 16.2 * 14 * 5cm / 6.38 * 5.51 * 1.97in<br>Item Weight: Approx. 114g / 4.00oz<br>Package Size: Approx. 20 * 17 * 6.5cm / 7.87 * 6.69 * 2.56in <br>Package Weight: Approx. 117g / 4.13oz<br><br><strong>Package List:</strong><br>1 * Customer Service Headphone