Bosch CCSD-CURD Control unit for CCS 1000 D Digital Discussion System with recorder and DAFS, Plug-and-play functionality, for quick and easy connection of up to 80 Discussion Devices, Intuitive web browser interface, control for advanced, configuration and control, Built‐in MP3 recorder with internal memory and USB recording, Built‐in Digital Acoustic Feedback, Suppression (DAFS) for ensuring superior speech intelligibility.