https://www.asmag.com/project/resource/index.aspx?aid=16&t=secutech-made-in-taiwan-products-and-solutions
Product Info
Ring Communications Pro700 Intercom System

Ring Communications Pro700 Intercom System

Ring Communications
Region: United Kingdom
Update: 10/16/2012
Key Specifications

The Pro700 Intercom System range is packed with lots of the features that you would expect to find in the higher-end intercom systems of other manufacturers. This is ideal if your business needs room for growth. Whilst optimum benefits are to be attained at around the 20-station installation level, an upper limit of 40 stations gives your business more than enough scope for the future.

* Max 40 stations, recommended 20 stations
* Standard power supply, 24-27V DC, 4A
* No system exchange All Call and two Group Calls with auto answer back
* One program distribution channel
* Simple installation, loop or Star cabling
* Hands-free conversation, semi duplex ? Remote control of external audible or visible signal devices
* Interface to Public Address
* 20 ohm loudspeaker can be connected

https://www.asmag.com/project/resource/index.aspx?aid=16&t=secutech-made-in-taiwan-products-and-solutions