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Which radio key in a Homesafe will be for Alarm and RF Receiver?

The radio key you will require will depend on the age of your HomeSafe Alarm (5400 Series) and RF Receiver (5400RF)

RK3+1 - is recommended for older alarms and receivers which utilize the short radio codes
RK4, RK4B or RK4P - - work with new alarms and receivers which utilize the long radio codes.

 
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