This product consists of a hands-free indoor station for wall mounting, made of high-quality ABS plastic and equipped with a speaker. It features four function buttons: talk on/off, door opener, light, and cancel call. The operation can be set to full duplex or half duplex. There are 12 harmonious ringtones available, of which 6 gong tones can be selected. Ringtones can be freely assigned to distinguish between door, floor, or internal calls.

The device offers electronic control of the ringtone volume, a ringtone separator with a control display, and an optical status indicator. It supports call waiting when a connection is active, call blocking, and automatic call disconnection after 3 minutes. Up to three indoor stations can operate in parallel. Floor call forwarding is done via the i2BUS to the parallel indoor stations. The rotary fix function allows for single-person commissioning by addressing with a rotary code switch.