4-pin Noise Cancelling Corded Binaural Headset Compatible With Desk Telephone

First, the use of the environment1. Ambient temperature: -10C ~ +40C2. relative humidity: 10% ~ 95%3. Atmospheric pressure: 86 ~ 106kpa4. environmental noise: less than equal 60dB (A)Second, the functional indicators1, microphone(1), omnidirectional anti-noise electret condenser microphone; optional single-point anti-noise microphone, signal-to-noise ratio greater than 58dB(2), sensitivity -40 3dB (0dB = 1V / Pa, at 1KHz);(3), impedance 2.2K ohms;(4), working voltage 2.0V;2, the receiver(1), broadband high quality receiver;(2), the impedance is 150 ohms;(3), the frequency range is 100-6600HZ;(4), the distortion is less than equal 5%;(5), sensitivity 100 3dB (1000, 12000, 1500, 2000HZ);3, the connection plug(1), high-quality anti-sway, low-resistance PU headphone cable (with anti-stretch wire tensile material);(2), the cable length is 2.65 meters (including the plug), and other lengths of the earphone cable can also be provided according to the user’s needs;(3), Optional with intermediate plug-in QD head, compatible with Plantronics or GN Netcom, with a plug-in life of no less than 10,000 timessize:18*12*3cmMaterial:plasticcolour:blackPackage Contents:1 * Binaural HeadsetOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.