Features:<br />1. Excellent sound quality, light weight, durable <br />2. Noise canceling, can reduce background noise <br />3. Hearing on two sides and microphone can be worn on either left or right ear <br />4. Very comfortable ear pad, comfortable for all day use <br />5. Adjustable headband, acoustic shock protection circuit<br /><br />Model number: XD600-02<br />Color: black<br />Frequency range(Hz): 20～24KHz<br />Fit design: over the ear<br />Feature: volume control, microphone<br />Interface: 4PIN RJ11 telephone crystal head<br />With volume control and mute function<br /><br />1. Wire<br />Cable length: maximum length: about 2m<br />Line breaking strength: not less than 10Lbs<br />Tensile test: connecting portion of wire and pins, the wire and earphone case should be connected reliably, can endure 1.5Kg pulling force, no loose or fall off and can work normally<br />Core structure: (8 / 0.1 + 250D) × 4<br />The total impedance: not more than 0.3Ω per meter<br /><br />2. Speaker specification<br />Type: moving-coil speaker<br />Impedance: 150Ω<br />Sensitivity: 118 ± 5dB at 20μPa = 0db, 1KHz<br />Center frequency: 800 ± 50Hz<br />Rated input power: 5mW<br />Maximum input power: 30mW<br /><br />3. Microphone<br />Type: electret condenser microphone<br />Impedance: 2.2K<br />Sensitivity: -50 ± 3dB at 20μPa = 0db, 1KHz<br />Frequency response: 30 ~ 16KHz<br /><br />1 x Telephone headset<br /><br />In original package<br /><img src="http://img6.eachbuyer.com/x9/p100/bi894_1.jpg" / noproxy>                                                        <img src="http://img6.eachbuyer.com/x9/p100/bi894_2.jpg" / noproxy>                                                        <img src="http://img6.eachbuyer.com/x9/p100/bi894_3.jpg" / noproxy>                                                        <img src="http://img6.eachbuyer.com/x9/p100/bi894_4.jpg" / noproxy>                                                        <img src="http://img6.eachbuyer.com/x9/p100/bi894_5.jpg" / noproxy>                                                        <img src="http://img6.eachbuyer.com/x9/p100/bi894_6.jpg" / noproxy>                                                        <img src="http://img6.eachbuyer.com/x9/p100/bi894_7.jpg" / noproxy>