The SPCV440.000 Combi Audio Expander extends the acre Intrusion system via X-BUS with an audio verification zone, 4 wired zones and 1 open collector output. The built in microphone and speaker allow pre- / post-event audio recording and live audio (listen / talk) between ARC/CMS and the acre Intrusion system. Up to 3 audio satellites (SPCV310/410) can be connected to the expander. In addition any of the MAGIC motion detectors (12m version) seamlessly fit into the prewired device to allow full use of the superb MAGIC motion detector benefits.