Some of you fellows are missing the secondary function / benefit of this little item...

It starts beeping as soon as there is A) power AND B) No signal to the radio.

What this does for you is tell you that the receiver is on and the Tx is NOT!!

It ensures that you know when (if) you have left the RX on and gone for a coffee, or bumped the switch as you are loading the plane into the car. It is also a good way to confirn a ground check on the system - do your function checks and then walk away 100' to confirm - if the beeps starts up at the 50' mark - you have a range problem!