This article covers Kensington ケンジントン 【正規品・3年保証付き】 Pro Fit Ergo Vertical ワイヤレストラックボール ワイヤレスマウス 9ボタン Bluetooth Windows.

Overview

The Kensington Pro Fit Ergo Vertical Wireless Trackball (K75370JP) is an ergonomic input device that tilts your hand into a 60-degree handshake position, reducing wrist strain during long work sessions. Unlike a conventional mouse, you control the cursor via a thumb-operated 34mm ball, so your entire arm stays stationary on the desk. This design saves space and minimizes repetitive motion. It connects via both Bluetooth and a 2.4GHz nano receiver, supporting up to three paired devices that you can switch between on the fly. The optical sensor offers three DPI steps for precision or speed, and all nine buttons are programmable with KensingtonWorks software. Battery life is solid—a single AA alkaline battery can last several months depending on usage.

Connectivity & Compatibility

  • Wireless: Bluetooth 5.0 + 2.4GHz (nano receiver stored inside the mouse) - OS support: Windows 10/11, macOS 10.13 and later - Multi-device: Remembers up to 3 devices; switch via a dedicated button on top - Compatibility: Works with any USB-A port (receiver included) or Bluetooth-enabled PC/tablet

Product Info

Released around January 2020, the K75370JP typically sells for ¥6,930 on Japan. It comes with a 3-year manufacturer warranty. The package includes the trackball, nano receiver, a test AA battery, and a quick-start guide. KensingtonWorks customization software is free to download from Kensington’s official site. This product sits in the entry-to-mid ergonomic tier. It offers genuine ergonomic certification at a price well below competing vertical trackballs from Logitech or CST. While the ball isn’t as smooth as high-end models, the overall build quality and button feel are very good for the price.

Best Use Cases

  • Office workers & programmers: If you spend hours clicking and scrolling, this trackball dramatically reduces forearm and wrist fatigue. It’s especially effective for right-handed users in a desk job. - Small-desk setups: No need for a mouse mat—the trackball stays in one place. Perfect for cramped desks or mobile workstations. - Transitioning from a standard mouse: The thumb-operated ball feels similar enough to a regular mouse that most users adapt within a week. However, left-handed users should note this is a right-hand-only design. - Not ideal for: Competitive gamers who need rapid, precise aim—a standard optical mouse will still outperform a trackball in FPS titles. Also, if you dislike non-standard pointing devices, the learning curve may feel frustrating initially.

Product Disclosure (Amazon)

  • Manufacturer: Kensington
  • ASIN: B084T1JLZ1
  • Note: This article covers a manufacturer-made product based on Amazon listing details.