Does the Room Alert 4E support 2 digital probes?

Detailed Question: 
As an external probe is already included, does that mean the 2 digital probes are that one + one other?

The 4ER Room Alert has one internal temperature sensor, plus 3 external ports. Two of these external ports are digital and one is a switch port. Therefore you can put the digital temperature sensor supplied into one of the external digital ports and have one digital port free and one switch port free.

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