Promotion!!!Generic 4-pin Crystal Monaural Telephone with Comfort Fit Headphone Monaural Headset Super Quality!!! Call Center quality headset, excellent sound quality, lightweight, durable and comfortable for all day use Flexible goose neck boom; Noise canceling microphone to reduce background noise Acoustic Shock Protection circuit; Hearing on one side and microphone can be worn on either ear Adjustable headband; Completed with a long Polaris coiled cord with RJ plug No QD(Quick Disconnect) included; Can be used for all Telephone7*24 hours customer service,please buy with confidence :)