The GT-MKB-N is a video guard station for the GT Series multi-tenant video intercom system. It can be surface mounted to the wall or a 3-gang electrical box, or may be desk mounted using the included desk stand. The GT-MKB-N features a keypad for calling both tenant and entrance stations. There is also a handset for private communication. There are up and down buttons to search for a tenant name via the directory, and a door release button to selectively open the entrance where communication is established.

The GT-MKB-N has two calling modes, standard (via tenant station) and emergency (via GFK-PS). When a standard call is placed, a normal call tone is heard and the name and number of the caller are displayed on screen. When an emergency call is placed, an urgent call tone is heard and the "EMERGENCY" screen with the name and number of the caller is displayed on screen. A standard call is reset by hanging up the GT-MKB-N handset and an emergency call must be reset at the tenant location.

The GT-MKB-N can be programmed manually, programmed via a PC using the supplied USB cable, or programmed via an Android™ device using NFC. A standard GT Series system will support 2 GT-MKB-Ns while an expanded system will support 4 GT-MKB-Ns.

The system has one talk path. When the system is occupied, a busy tone will be heard if another call is attempted.