The four hot keys are Web key, Volumekey,Mute key. The three USB HUB interfaces resemble the computer USB port. Made of high quality PVC material on the surface of the mat, it allows the mouse to glide smoothly and at precision points. The product is designed with LED light that is helpful when used at night or in darke places. Technical Characteristics USB interface Just plug your USB device to the USB port then it is ready to use. There is no need for any USB driver.Operating System,Windows 98/2000/ME/XP Linux & Mac..