To the participant the most important part of a conference system is the discussion unit. Bosch has built on the elegant design of the DCN Next Generation discussion units to create a new series of wireless discussion units with unrivalled looks and features. The Central Control Unit (CCU) includes features for controlling wired and wireless delegate microphones, distributing simultaneous interpretation and conducting voting sessions, all without an operator. In combination with a PC, this control unit brings greater sophistication to conference control. The DCN Wireless Access Point (WAP) links the central control unit (CCU) and the wireless discussion units by means of secure wireless communication with 128‑bits AES Rijndael encryption. It uses one of the three non‑overlapping‑carriers in the 2.4 GHz band, which is license‑free worldwide.