Electronic door phone only for replacement of Fermax analogue telephones (with 5 wires of connection). It is not a universal phone, nor is it valid for the substitution of other brands. This model is the next to 3393 but adds two programmable buttons, volume control and power button on / off. Made of high-impact ABS plastic, it has ultraviolet protection for greater resistance to light. Easy installation. Uses the conventional system of common threads plus 1 call wire, called 4 + N.
