Asus Z9NH-D12 - Manual (Page 53)

ASUS Z9NH-D12 Series 2-31
3. Thermal sensor cable connectors (3-pin TR1, TR2)
These connectors are for temperature monitoring. Connect the thermal
sensor cables to these connectors and place the other ends to the devices,
which you want to monitor temperature.
4. USB connectors (5-1 pin USB3; A-Type USB4)
These connectors are for USB 2.0 ports. Connect the USB module cables to
connectors USB3, then install the modules to a slot opening at the back of the
system chassis. These USB connectors comply with USB 2.0 specification
that supports up to 480 Mbps connection speed.