Aiphone’s DB series has the capacity of one door station and up to 5 internal hands-free audio units. The DA series features simple two wire cabling (from door station to internal master and 6 wires between internal units). Lock release is from the door station - output is 12VAC. A bridge rectifier is provided to convert to DC if required. Auto gate control is available by the use of a CR2 relay. Each internal unit has service switch and one external call chime (IER2) is available per system.

DA2DS (2 button) and DA4DS (4 button) door stations are available for duplex or 4 unit apartment blocks.