Just bought a Dell TB16 dock with a 240w power supply for my Dell XPS 15 7590 for $85 USD. Im getting full charging capabilities and data transfer capabilities with just one
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XPS 15 Inch 9570 High Performance 4K Laptop with InfinityEdge | Dell UAE
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Dell Thunderbolt Dock TB16 - Docking station - Thunderbolt - VGA, HDMI, DP, Mini DP, Thunderbolt - GigE - 240 Watt - for Latitude 5290 2-in-1, 5480, 5491, 5580, 5591, 7280, 7285 2-in-1, 7290, 7380, 7390, 7390 2-in-1, 7480, 7490; Precision Mobile ...
Dell XPS 15 9570 i9 2018 - Developer review
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Amazon.com: New Thunderbolt Dock WD19DC, The Ultimate connectivity for XPS 13 9380 7390 9575 9570 7590 Precision 5540 2-in-1, 7740 7540 LAT 7400 7390 7389 Plus Premium Best Notebooks Pen Light (Renewed) : Electronics