Interface: USB 1.1 Audio Frequency: 100Hz ~15K Hz Skype API: Windows 2000 (SP4)/ XP (SP1, SP2) Support OS: Windows 2000 (SP4) / XP (SP1, SP2) Dimension: 45mm X 125mm Weight: 120g - Update: 2007-01-30

Low noisea??digital tonea??exceed long distance. HCT-B2420S is strong telephone keyboard to receive & dial out call conveniently. Dial hand-freea??LCD glass screen night light function Call ID function when call coming. Automatic shake-ring when... - Update: 2007-01-30

IEE 802.3/802.3 u 10 Base T/100 Base TX Major G.7XX audio codec H.323 V4 MGCP RFC2705 SIP RFC3261 Private protocol TCP/IP : Internet transfer and control protocol RTP: Real-time Transport Protocol RTCP: Real-time Control Protocol VAD-CNG s... - Update: 2007-01-30