Skype Optical Mouse USB Built-in VOIP Phone and Speaker 3 in 1: Mouse, VOIP Phone, and Speaker! Comfortable, colorful, and stylish design For left and right-handers Precise tracking with 800dpi optical sensor. Supports many Voip service, such as Skype, VoipBuster, VoipStunt, VoipCheap, VoipDiscount, SparVoip, Internetcalls, poivY, Webcalldirect, VoipCheapCom, FreeCall and NetAppel.