VIS-EXM-P is full digital extension main unit for 1000M network conference units. It not only provides stable power supply support but also effectively enhances signal transmission. The device supports cascading in a ring system structure and can expand up to four channels to connect paperless conference units. When a paperless conference unit lacks sufficient power, the VIS-EXM-P can supply additional power, ensuring that the VISSONIC conference system host can smoothly connect more paperless conference units to meet the needs of large-scale conferences.​