With more than 7,000 units bought in the past month, the Anker Power Expand 553 is Amazon’s best selling docking station (or USB Hub as it is also known). For Prime Day, its sticker price has been cut to $39.99, down from $69.99.(Check out our best laptop docking station buying guide, our selection of Prime Day laptop dock and USB hub deals as well as TechRadar’s Prime Day deal live blog)You can plug two 4K monitors, two USB ports,
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