Dell K20A (WD19TB) Thunderbolt Docking Station - Grade C. Model: WD19TB (Regulatory Model: K20A). Type: Docking Station. This is aThunderbolt 3 docking station. While it is backward compatible with standard USB-C ports (in a limited capacity), it performs best when connected to a computer with a Thunderbolt 3 or Thunderbolt 4 port.
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