Skype mouse phone features: 1) 800dpi optical senor 2) Crystal clear sound quality 3) 48 KHz sampling rate 4) Supplied earphone to protect your privacy. 5) Auto detection between mouse and VoIP phone 6) Seamlessly integrated with Skype, VoipButser, VoipStunt, VoIPCheap, VoipDiscount, SparVoip, Internet calls, poivY, WebCallDirect, VoipCheapCom, FreeCall and NetAppel. 7) Monochrome 128*64 pixel LCD with backlight. Supports all kinds of languages 8) VoIP Contact List, Call List, Call history,time,and caller ID display on LCD screen