Extra tabs on System Sensor MA/SS

I just recently acquired a System Sensor MA/SS, and while I know that the A, B, and C tabs are used to change tones, I found a D and E tab on the other side of the alarm. Does anybody know if it actually does anything?

Tone changing wise, no they don’t do anything. However, breaking those tabs off will allow for Four-wire operation of the device (separate horn and strobe, can allow for audible silence).

Here’s the manual for reference:

Thanks. I don’t have a fire panel so my alarm is just on a simple circuit, so if I break off the tabs will I be able to run two extra wires to the pull station for the horn?