macOS Big Sur, Apple Silicon Ready.
Ver 5.5.6
Try free for 30 days.
Paid upgrade for all users of ver 4.
Download ver 5.2.3 for macOS 10.6 - 10.11
Download ver 4.2.6 for macOS 10.4 - 10.10

Elecom Deft Pro On X-mouse Button Controller

【THE DEFT PRO TRACKBALL】: It is fast, efficient, and more durable thanks to reliable, gaming-grade parts inside. This means you can use it for longer and with more reliability than standard ELECOM mice 【CUSTOMIZE】Mapping your 8 buttons and up/down wheel directions becomes easier with ELECOM Mouse Assistant. The Deft Pro also has a very solid scroll wheel. However, the movement of the wheel ball is scratchy on both Deft Pros I own. Obviously that's fixable - but it would be so much easier for Elecom to fix that in production than asking their customers to do so. So, upgrading to the Huge, I found the movement of the ball to be a million times better.

System Requirements

macOS Sierra (10.12) to Big Sur (11).
USB and Bluetooth mouse.
(Apple Magic Mouse and Magic Trackpad are not supported.)

Update History

5.5.6　(Jun 8, 2021)
Now supports Microsoft Sculpt Ergonomic. Now supports Logitech MX Vertical and M705. Problem solved where “Enter keys only at the beginning of rolling” option of Keyboard Shortcut would not work on the Logitech MX Master. Problem solved where USB connection error would occur.

Elecom Deft Pro On X-mouse Button Controller

5.5.5　(Mar 1, 2021)
Added “Same as Default” option to the wheel mode that is available for some mice. You will need to re-configure the wheel mode with this addition. Problem solved where “Double Click” assigned to a button of chord operations would not work with the list view of Finder. Problem solved where opt + space + primary click would not work as hand scrolling in Preview.app. Problem solved where the Restore System Defaults button would not work.
5.5.4　(Nov 9, 2020)
Supports Logitech MX Anywhere 3 for Mac. Problem solved where Razer Bluetooth mice would trigger some buttons unexpectedly.
5.5.3　(Oct 13, 2020)
Problem solved where some Logitech mice would not be recognized properly.
5.5.2　(Oct 5, 2020)
Added a note column to the chords tab. You can write a note to a chord operation. Problem solved where some buttons on Razer mice would not work.
5.5.1　(Sep 10, 2020)
Problem solved where some buttons on ELECOM mice would not work.
5.5　(Sep 7, 2020)
Supports macOS Big Sur and Apple Silicon Macs. Supports Logitech MX Master 3 for Mac. Problem solved where 'Service is disabled Error' would occur.
5.4.5　(Apr 27, 2020)
Improved the scroll behavior of Auto Scroll. Prevented “SteerMouse is an application from the internet” message every time you boot the computer. Problem solved where the trackpad on MacBook Pro (16-inch, 2019) would not be recognized as an internal trackpad. Problem solved where some buttons on Logitech G604 would not work after the computer woke up from sleep.
5.4.4　(Feb 17, 2020)
Improved the behavior of Application Switcher. Problem solved where SteerMouse Manager would cause an exception error.
5.4.3　(Nov 18, 2019)
Added “Back” and “Forward” to System Control. They will work with more web browsers and editors. Added “Smart Zoom” to System Control. It zooms in and backs out of a webpage or PDF. Supports Logitech G604. Problem solved where an error would occur every time a game controller is connected.
5.4.2　(Oct 15, 2019)
Problem solved where some mice would not be recognized. Problem solved where the side buttons on the Logitech M560 would not work. Problem solved where some error messages would not be shown.
5.4.1　(Oct 7, 2019)
Supports macOS Catalina 10.15. Supports Logitech MX Master 3. Supports Logitech PowerPlay with Logitech G903 and G502 LIGHTSPEED. Added “scroll direction” option to Auto Scroll. Added “Check for Updates” button to “License & Support” tab. Reduced the issue that Trackball mode of Auto Scroll would scroll other than windows under the mouse cursor. Modified some error messages.
5.3.8　(Jun 18, 2019)
Supports macOS Catalina 10.15 beta. Supports Logitech G502 LIGHTSPEED (PowerPlay not-supported). Supports Logitech MX518 (2019). Problem solved where the cursor auto snapping would not work in some applications. Problem solved where cursor speed settings would not be displayed correctly in recommended window.
5.3.7　(Apr 2, 2019)
Problem solved where suddenly some buttons would stop working. SteerMouse is notarized using Apple’s Notary Service. It is now ready for an upcoming macOS release.
5.3.6　(Mar 26, 2019)
Now supports Microsoft Surface Precision. Problem solved where some buttons would stop working on some Macs.
5.3.5　(Feb 18, 2019)
Problem solved where SteerMouse Manager would occasionally stop working.
5.3.4　(Feb 5, 2019)
Problem solved where SteerMouse would interfere with tablet drawing. Problem solved where some buttons on Logitech MX Master 2S would not work after wake up. Now supports Logitech G502 HERO.
5.3.3　(Dec 17, 2018)
Problem solved where some buttons on Logitech MX Master 2S would not work. Problem solved where an error would occur on some old mice.
5.3.2　(Sep 25, 2018)
Added “Key Repeat” option to Keyboard Shortcut. Supports Dark Mode in macOS Mojave. Problem solved where some buttons on Logitech MX Master 2S would not work. Problem solved where side buttons on Microsoft Surface Precision Mouse would not work.
5.3.1　(Jul 25, 2018)
Problem solved where accessibility warnings would not disappear.
5.3　(Jul 11, 2018)
Now supports macOS 10.14 Mojave. System requirements have been changed. Now requires macOS 10.12 or later. You can download ver 5.2.3 for older versions of macOS from here. Problem solved where “System extension allow button” in System Preferences would not click. Various bug fixes and improvements.
5.2.3　(May 14, 2018)
Now supports ELECOM DEFT Pro Trackball. You can now customize the tilt wheel left/right and DPI buttons on Razer Naga Trinity. Various bug fixes and improvements.
5.2.2　(Apr 2, 2018)
Now supports Razer Naga Trinity. Problem solved where dragging would be canceled when you move the cursor by internal trackpads. Problem solved where an error would occur if you turn on the cursor auto snapping.
5.2.1　(Dec 19, 2017)
Now supports Logitech MX ERGO, Microsoft Surface Precision Mouse. Made the cross icon smaller for Auto Scroll / Trackball mode. Now you can constrain the scroll direction of Auto Scroll by pressing shift key. Proble