Tele System Hello Quick Start Manual page 8

8 TELE System
4.2 Indoor Unit
1. STOP: stops the ringtone
2. MUSIC: choice of ringtone
3. PLAY: play the ringtone
4. SPEAKERS
5. VOLUME: adjusts ringer volume
6. Power Connector: connect the two wires (red and black) to the respective inputs of the external unit respecting the color
Hello (see Chapter 4, "connections outdoor unit 5 RD: DC12V" and 6 BK: Mass (GND))
NOTE
The internal unit is designed only to issue a warning (ringtone) when a visitor presses the button on the monitor.
The indoor unit must be installed inside the building.
The duration of the ringtone is about 10s.