The turn-on beeps from the controller are supposed to tell you if you're in FCC or CE mode, but I can't find the information in my manual. Someone said that one beep is CE and two beeps is FCC. I get three beeps as well.
Thanks Steve. That's really interesting. My controller had about 46% left so I don't believe it was battery warning. When I turned it off and on again it didn't beep