Asus PRIME Z490-A - Pin Power Plug LED; Q-Leds

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Chapter 1: Product Introduction
Chapter 1
21. Thunderbolt header
The Thunderbolt header allows you to connect an add-on Thunderbolt I/O card
that supports Intel’s Thunderbolt Technology, allowing you to connect up to six
Thunderbolt-enabled devices and a DisplayPort-enabled display in a daisy-chain
configuration.
The add-on Thunderbolt I/O card and Thunderbolt cables are purchased separately.