The AI-AX-8MV is an audio video master station for the AX Series. The unit is CAT5e homerun wired to it's CEU and features a 3 -1/2" TFT monitor, an oversized TALK button to activate the VOX or PTT style communication, door call-in indicator, call button for other master stations in the system, a call tone volume control and a button for door release. The AX-8MV can communicate to 8 masters and 8 door stations. Add-on selectors (AI-AX-16SW) can be added to increase the number of doors to maximum 120.