Here comes a crazy combo gadget, that combines more functions than the average geek would need, the LED Message Mouse. As well as being a standard USB mouse, it can also display messages with the built in LED display, you can display message up to 12 characters, and it also has a built in fan to keep your hands nice and cool. 1. Optical mouse with USB connector 2. A fan equipped at the bottom prevents hand sweat 3. Glittering image and character are peresented based on request 4. LED duration lasts for 5 thousand . 3-Buttons including central scroll wheel . USB PnP: With no software . Dimensions: 120(L)*65(W)*40(H)mm . Cable type/Length: Shielded/140cm . Resolution: 800dpi . OS: Win98/Me/2000/XP/Vista