Yealink YHS32 Headset with Noise Canceling Type: Headset Specifications: Ultra noise cancelling microphone Superb sound quality Quick disconnect Applies to Yealink IP Phone SIP-T2X,SIP-T3X and SIP-T4X 330 degree rotatable microphone boom Ultra light weight only 50g Comfortable wearing, for all day use Strong design, with boom rolling of about 30,000 times and more Over-the-head style, can be used with right or left ear Pliable steel headband, large size ear pad and padded T-bar ActiveProtectionTM safeguards the user from high levels of acoustic burst Physical Features 1 x RJ9 headset jack 1 meter cord line Quick disconnect (QD) cord Transmit Sensitivity: -38.0 dB re. 1 V/Pa Receiver Sensitivity: 95dB SPL +/-3 dB SPL Receiver Impedance: 150 ohm Voltage range: 1.0-10 V