Status indicator light on P4 next to USB port

Can someone please explain the meaning of the little (yellow?) status indicator light on the left side of the P4, just above the micro-USB port. Mine is blinking yellow, but I don’t see any reference to its meaning in the manual.
Thanks.
–JN

That is the button used to link your controller. Is the controller working with the aircraft?

Yes, the controller seems to be properly linked although I haven’t tried to fly the P4 yet. That little button was yellow/orange when I first submitted my post. Since then I updated the firmware and the little light is now green.
Thanks for your response.