Features ? The most creative design: Mouse with VoIP Phone Features ? 128*64 pixel multi-language-supported LCD screen with backlight ? 1000 DPI optical sensor ? Crystal clear audio with 16bit 48 KHz sampling rate. ? Also compatible with Internercalls, SparVoip, NetAppel, poivY, VoipDiscount, VoipCheap and WebCallDirect ? Seamlessly integrated with X-TAPI Lite/Pro and BeyondTel's SIP Softphone . CE,FCC,RoHS