Hi what range will this work over? Do you need to connect this to the mains like a telephone?

You do need to plug into the mains, but I gather it transmits over the earth circuit of the house you are in. Its range is therefore as big as your house and bigger if, say, you have a shed in the garden which is also on your mains circuit. Quality of transmission is 'good enough' but less good than a telephone. Its advantage is simplicity.

Brand	COMMAX
Manufacturer	COMMAX
Number of Items	1
Colour	230 V Ac, White
Batteries included?	No
Batteries Required?	No
Guaranteed software updates until	unknown

COMMAX 2x ACI FARFISA 1006, Kit of two wireless intercom units using power supply modulation for signal transmission

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