as a mouse: 1) 1.5m usb cable (usb 1.1) 2) 800 dpi optical sentor as a hi-fi speaker: 1) crystal clear sound quality 2) 48 khz sampling rate 3) supplied earphone to protect your privacy. as a voip phone: 1) auto detection between mouse and voip phone 2) seamlessly integrated with skype, voipbutser, voipstunt, voipcheap, voipdiscount, sparvoip, internetcalls, poivy, webcalldirect, voipcheapcom, freecall and netappel. 3) monochrome 128*64 pixel lcd with backlight. supports all kinds of languages 4) voip contact list caller id display on lcd screen 5) hands-free speakerphone function 6) various chord music ring tones catering to different tastes. 7) fully functional keypad and lcd screen enables you to make/receive calls without using keyboard and mouse. danny@vnetphone.com