I used have the same doorbell with two receivers. The brand is TECKNET. One used make the normal "DingDong" sound and the other one the famous sound of the bell called "Big Ben". And I have the hardwired intercom which just makes a whirring noise when someone rings the bell.
I clicked your Amazon link and too bad this is no longer available. I had a doorbell that functioned this way in the early-mid 1990's with the exception mine only had one bell tone. It was great though!
i’ve just got this doorbell but when people press it outside they can’t hear it but i can hear it from the plug in part is that how it’s meant to be or is it supposed to ring outside as well as mine’s only ringing from inside?