Originally posted by Racing4Evo
The 3PK comes in two versions: HRS and PCM. You can't have the fail safe feature of the 3PK if you get the HRS version.
You can have the built-in frequency and battery fail safe on the HRS as in PCM. The confusion comes about because the 3PK manual states that you cannot use an external type fail safe when using HRS receiver. Not that fail safe will not work in HRS mode...