Akuvox Long Data Transmission 2-Wire IP Network Switch (NS-2)The NS 2 is Akuvox 2 wire IP network switch which provides a convenient way to upgrade analogue intercom systems, no need for rewiring. Its super long transmission distance & good compatibility with existing lines makes it fit for most of old buildings. Support network and power supply for R20A 2 or C313W 2 through 2 wire cable Support multi level cascade through 2 wire cable Connects up to 6 pcs of Akuvox 2 wire IP intercom devices Super long