comes with power supply unit, ref: DOCKS
eBay
Joblot for 4x Microsoft 1661 Surface Docking Station, all units are in good working order, some may have slight cosmetic scuffed. A versatile unit compatible with various Microsoft Surface models such as Pro 8, Laptop Studio, and Go 3. With multiple ports including DisplayPort, HDMI, and USB 3.0, this docking station allows for seamless connectivity and convenience. Made of rigid plastic, this docking station is designed for passive cooling and features built-in USB ports for added functionality. Powered by an AC adapter, it is a reliable and practical accessory for expanding the capabilities of your Microsoft Surface device.
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eBay
GOOD USED TESTED AND WORKING CONDITION. REF:DOCKING
eBay
The Microsoft 1661 Surface Dock is an accessory designed to expand the connectivity options and power capabilities of Microsoft Surface devices. Microsoft Surface Dock 1661. Compatibility: The Microsoft 1661 Surface Dock and Power Adapter is designed to be compatible with a range of Surface devices, including Surface Pro, Surface Laptop, Surface Book, and Surface Go models.
eBay
Surface Pro 3 dock fully working. Power supply not included - listed separately.
eBay
· Model: 1661. Fully tested Microsoft Surface Docking Station (1661). Perfect working condition, ready to transform your Surface into a desktop workstation. · Microsoft Surface Dock (Model 1661). · Fully Compatible: Surface Pro 3, 4, 5, 6, 7, Surface Laptop (1st Gen), Surface Book (1st Gen).
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eBay