External unit expansion kit consisting of EX-DSME external unit (die-cast aluminium front panel, colour camera and single LED for night-time lighting, mechanical buttons with the option of setting 1 to 4 call buttons via dip switch, indicator LEDs for call sent, lock-release triggered, audio activated and system busy, speaker volume adjustment and audio balancing, power supply via bus line) and the 1405 video splitter for adding an expansion external unit (audio/video switching module for 2-wire digital systems, for connection of an additional EX-DSME, power supply via bus line, 2 DIN modules). Compatible with HFX-70200M, HFX-7000MW, HFX-8000M and HFX-9000M.