This USB MIDI cable adapter has 3 indicator lights:

• USB connection indicator (red)
• MIDI out activity (green)
• MIDI input activity (yellow):

Compatible with Windows XP and includes a standard Windows MIDI device driver.
Driver is pre-loaded onto the USB device and will automatically install when plugged
into a USB port.

Instructions:
Connect the USB connector into one of your USB ports on your computer. Connect the
round MIDI plug labeled 'out' to the 'in' port on your MIDI keyboard. Then connect the 'in'
plug to the 'out' port on your keyboard. This may seem reversed, but what is 'out' to the
PC is 'in' to the keyboard.