... sample rate, presenting CD-quality music and high fidelity sound.3. HI-FI amplifier and high-quality speaker.4. Full-duplex conversation ... Skype, UUcall, Alt QQ, MSN, Talk, Yahoo, Sip Discount, X-Lite, Eyebeam, X-pro, Sipgate, IPhone, Vonage, UBIFONE, Imtel, Voip Buster, Voip ... Volume+, volume-, mute speaker and microphone buttons.4. Driver and sound card built-in. Interface: 1. One USB interface to PC ...