24V DC – Use PS-2420UL (for GT-BC, GT-VBC, GT-NS, GT-MK, GT-BCX, and GT-2C)
There are three different types of call tones: from entrance station, video guard station, and doorbell
Secure single channel
Hands-free, voice-actuated communication or push-to-talk communication
Two conductor cables (Aiphone #872002 for audio and Aiphone #871802 for video)