Anyone who works with numbers will appreciate the power and portability of this USB Mini Numeric Keypad. It is the ideal accessory for anyone who is concerned with efficiency and convenience. Even though it has a Macintosh layout, but it also works with Windows as well. The IKP-130 includes two USB downstream ports for extra USB devices such as a mouse, keyboard, digital camera, printer, and etc. The convenience of these extra ports combined with a sleek, elegant and durable design that weights a mere 3 ounces; making the IKP-130 a perfect mobile accessory for Mac and PC users.