Asus Z170-PRO Manual page 42

2. T_Sensor connector (2-pin T_SENSOR)
This connector is for the thermistor cable that allows you to monitor the temperature of
your motherboard's critical components and connected devices.
The thermistor cable is purchased separately.
3. Digital audio connector (4-1 pin SPDIF_OUT)
This connector is for an additional Sony/Philips Digital Interface (S/PDIF) port. Connect
the S/PDIF Out module cable to this connector, then install the module to a slot
opening at the back of the system chassis.
The S/PDIF module is purchased separately.
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Chapter 1: Product Introduction