Your personal computer can waste a lot of energy when left idle. Reduce your electricity bill and your carbon footprint with the USB eco button. It illuminates as a reminder for you to press it when ready to leave your computer. When pressed, it activates the most economical sleep mode available. When you return to your computer you will instantly continue where you left off. Savings in both electricity costs and carbon footprint are displayed on screen. Supports Window 2000/XP/ Vista 32bit.