PLEASE NOTE: This AmTech headset requires an AmTech QD Cord to connect to your IP Phone. AMTECH AT308S SUMMARY: The AmTech AT308S headsets flexible gooseneck microphone boom easily adjusts to the ideal position for talking. Ultra noise cancellation protects callers from potential background distractions. Superb call clarity, a light weight design, and a comfortable leatherette ear cushion provides users with the ideal communication experience. The AmTech AT308S was designed with the most demanding phone users in mind. AMTECH AT308S CORE FEATURES: - Monaural headset Light weight design - Superb receiver audio quality - Excellent noise cancellation - Anti acoustic shock circuit - Flexible microphone boom - 330° rotatable microphone arm. - 180° rotatable joint of speaker and headband - 60mm adjustable pliable steel headband - Quick disconnect for leaving desk without taking off headset - Comfortable and reliable for all day wearing - Compatible with almost all kinds of phone systems - CE, FCC, and RoHS certificated AMTECH AT308S TECHNICAL SPECIFICATIONS: Speaker: - Drive Style: Dynamic (Moving-coiled) - Outer Diameter: 27mm - Frequency Response: 300HZ-3.0KHZ - Sensitivity: 108±3dB (at 1 KHz 1mw) - Resistance: 150Ω+/-20% - Rated Input Power: 30mW - Power Handling Peak: 50mW Microphone: - Directivity: Cardioids (Uni-Directional) - Size: φ6.0* 2.7mm - Frequency Range: 50HZ ～ 3.5kHZ - Sensitivity: -46 ±3dB (0dB=1V/Pa, 1 KHz) - Resistance: 2.2k ohm - Voltage: 3.0 V - Electric Current: 100uA~400uA - Withstand Voltage: 1.0~10.0V