RJ11 Telephone Headset Noise Cancelling Microphone Earphone Headphone For Desk Phones<br>Features:<br>Stylish design， lightweight， durable and comfortable for all day useQuick-disconnect functionAdjustable metal headband can be adjustedReplaceable soft foam or soft leatherette ear pad optionalNoise-cancelling microphone filters out background noise， so voice transmission is exceptionally clear.Bendable mic arm 330 degrees rotatable to be positioned for optimal comfort and voice transmission. Swing-sway feature lets you move the mic out of the way for beverage breaksSpeaker and headband connection rotate 360 degree<br>Specification:<br>          Speaker Sensitivity       108dB&amp;plusmn;2dB\/mw at 1KHz           Speaker Frequency Range       200-4K Hz           Microphone Frequency range       20-3000Hz           Microphone Impedance       150&amp;Omega;&amp;plusmn;5&amp;Omega;           Microphone Sensitivity       -58dB&amp;plusmn;3dB           Maximum Power       10mW           Material       Metal， ABS and POM   <br>Package Included: <br>1 x RJ11 Telephone Headset (not include Telephone and Laptop)<br>Detail Pictures: