... of caculator; 4.good quality with CE Multifuctional USB Hub Mouse Pad with Calculator Features:1.10 digits Calculator 2 ... +, M-, MRC 3.Can used as Mouse Pad 4.3 USB Hubs 5.USB 1.1 6.Super slim, only 7mm ... on/off switch (turn off when use as a mouse pad) 9.Can use external power adapter (5V, ... included. They include 3 different ports for your USB gadgets. The mouse pad also gives a nice bright blue ambient ...