Syba PC Voice Chat Headset with USB Audio Adapter (SY-AUD50057) Tangle-free Cord with In-line Microphone and Call Control Extreme Comfort and Fit Leatherette Ear Cups Gold Plated 3.5mm 4-pole Connector Compatible with Smartphones, and Tablets Acoustic Design: Dynamic, Closed-back Frequency Response: 20 - 20KHz Speaker Sensitivity: 116dB SPL (1mW) @ 1KHz