mamba maxx?

[BrianG]

What servos are you going to hook it to? The failsafe simply monitors the signal from the receiver and if it sees that it looks like it isn't a valid singal, it interrupts the signal and outputs a preset signal to the ESC. Obviously, you'd set this to a neutral setting. So, you can hook it directly to the ESC. Once out of range, the failsafe should put the ESC into neutral.

The only problem with an external failsafe is that it monitors for an invalid servo signal. If the noise looks a lot like a valid signal, it will let it go to the ESC and who knows what will happen. A failsafe built into a receiver on the other hand looks at the transmitted signal so it's a little "smarter" IMO.