With Nice's revolutionary BlueBUS system far fewer connections are required, which means incredible time savings: just two wires carry both the communication signals and the power supply! Installations are quick to execute and easy to upgrade and expand at any time by simply connecting two additional wires at any point of the BlueBUS network. With BlueBUS you don't need to observe polarity, therefore any related risk factor is eliminated. Products which have Nice BlueBUS technology communicate together so that all the devices linked up to the BlueBUS network can be recognized simply.