If you turn the reciever off, and don't turn the transmitter off an on, when you turn the reicever back on it will see its tranmitter on the last two channels it used, connect instantly, and flash the lights tell you that the power went out. Its not smart enough to know if you turned it off, disconnected the battery, or if you had a problem in flight.

When you cycle the transmitter it picks two new channels and when the receiver links up the lights will come on solid.