This article covers Kensington SD4840P トリプル4Kディスプレイ USB-C ドライバーレス ドッキングステーション 85W PD DP++.

Overview

The Kensington SD4840P (model K33806NA) is a driverless USB-C docking station designed for Windows laptops that support DisplayPort Alt Mode and Power Delivery 3.0. It delivers up to 85W of charging power and 10Gbps data transfer over a single USB-C cable, making it a solid choice for professionals who need a clean, single-cable desk setup. This dock supports triple 4K output when paired with a DisplayPort 1.4 DSC-capable laptop, and offers a total of nine ports including dual DisplayPort++ 1.4, HDMI 2.0b, Gigabit Ethernet, and multiple USB 3.2 Gen2 ports. No driver installation is required — just plug in and the dock is immediately recognized on Windows 7 and later.

Connectivity & Compatibility

The SD4840P connects via USB-C with DisplayPort Alt Mode and Power Delivery 3.0. It is designed exclusively for Windows laptops; Mac and Chromebook are not officially supported. Video outputs: 2× DisplayPort++ 1.4, 1× HDMI 2.0b Data ports: 1× USB-C 3.2 Gen2 (10Gbps, up to 6V/1.5A), 3× USB-A 3.2 Gen2 (10Gbps) Networking: 1× Gigabit Ethernet (RJ-45) Audio: 1× combo audio jack * Charging: USB-C PD 3.0 up to 85W When connected to a DP 1.4 HBR3 DSC laptop, the dock supports single 5K@60Hz, dual 4K@60Hz, or triple 4K@30Hz. With DP 1.2/HBR2 devices, maximum output drops to single 4K@30Hz or dual 1080p@60Hz.

Product Info

The Kensington SD4840P (K33806NA) launched in late 2021 and sits in the mid-to-high tier of USB-C docking stations. Its key differentiators are driverless operation and dual DisplayPort outputs, which are less common among competitors in the same price range. Pricing typically falls around ¥16,000–¥18,000 in Japan, making it a competitive option for users who need triple 4K output without paying for Thunderbolt 4 docks. The dock comes with a 3-year warranty, a USB-C cable, a power adapter, and a quick-start guide. Kensington also offers the DockWorks utility for firmware updates and port management.

Best Use Cases

Remote workers with triple-monitor setups — If you need three external displays from a single USB-C laptop, the SD4840P delivers without requiring driver installation. IT-free deployment is a major plus for small teams. However, Mac users should look elsewhere. Office workers seeking desk decluttering — With 85W PD pass-through, you can charge your laptop and connect peripherals through one cable. The dock can be mounted vertically or horizontally to fit tight spaces. * Users with DP 1.4 DSC laptops — To unlock the full triple 4K or dual 4K@60Hz potential, your laptop must support DisplayPort 1.4 with DSC. Older DP 1.2 laptops will see reduced resolution, so check your laptop's specs before buying.

Things to Consider

This dock is Windows-only. Mac and Chromebook users will not get video output or charging functionality. Additionally, the laptop must support USB-C with DisplayPort Alt Mode — not all USB-C ports are created equal. The triple 4K@30Hz output is only achievable with DP 1.4 DSC-capable hosts. If your laptop uses DP 1.2, you are limited to single 4K@30Hz or dual 1080p@60Hz. Make sure to verify your laptop's DisplayPort version before purchasing. 85W PD charging is sufficient for most ultrabooks and thin-and-light laptops, but high-performance gaming laptops may still require their original AC adapter for full power. The dock itself is not compatible with Thunderbolt 4-only peripherals, though it works over Thunderbolt 3/4 ports in USB-C fallback mode.

Product Disclosure (Amazon)

  • Manufacturer: Kensington
  • Seller: Amazon US
  • Fulfilled by: Amazon US
  • ASIN: B09F8J9ZLB
  • Note: This article covers a manufacturer-made product based on Amazon listing details.