Pretorian nAbler Pro Trackball

The n-ABLER Pro Trackball is specifically designed for computer users with limited hand control, motor skill difficulties, poor hand-eye-coordination, limited manual dexterity, involuntary muscle spasms and hand or wrist tremors.

Building on the huge success of n-ABLER, n-ABLER Pro was introduced to satisfy the needs of older users. We observed that once users became teenagers, they would tend not to want to use n-ABLER since they associate the brightly coloured buttons with children?s products. Similarly, ageing users generally did not want to use a product which was clearly meant for children, yet their needs are in many ways similar to younger users.

In answer to this, we launched n-ABLER Pro. It has a modern silver over black colour scheme and black buttons with white legends, which are great for users with visual impairments.

Because ageing users can sometimes exhibit tremors, we also built in a unique anti-tremor facility which filters out the tremors, leaving the underlying movement of the joystick or trackball. There are four selectable levels of anti-tremor filtering, and the feature may be turned off for users who have no need of it.

Dwell Clicker is a new feature recently incorporated into n-ABLER Pro, allowing users to achieve completely switch-free selection of items on screen. Simply allow the cursor to dwell over the item in question for a pre-determined (but selectable) period and n-ABLER Pro will click it for you!

Of course, all the great features that you already associate with n-ABLER such as cursor speed settings, drag-lock, double-click, programmable switch adaptation and driver-free operation are still available in n-ABLER Pro.


  •  Rugged construction and ergonomic design with a large footprint for maximum stability.
  •  Modern silver-over-black colour scheme.
  •  NEW- Dwell Clicker feature.
  •  Pan Button to allow easy navigation of documents
  •  Symmetrical design for use with either hand, with Integral wrist support to minimise fatigue.
  •  High mass, 63mm, free-running ball for easy cursor control
  •  All buttons have white legends on black backgrounds for easy identification of button functions.
  •  Switchable left and right click buttons. Plus Double click and latching drag lock buttons.
  •  Audible (switchable to mute) and visual warnings indicating selection or change of function.
  •  Anti-tremor button (with three settings to compensate for the degree of tremor) to improve cursor control. Cursor Speed can also be controlled.
  •  Easy ‘plug and play’ installation
  •  Does not require driver software – ideal for contract managed computer systems
  •  Auto detecting PS2 and USB protocols
  •  Three-point fixing for mounting systems.
Dimensions 23.5 × 13.0 × 10.0 cm
Connection Type

USB Type-A (Wireless Dongle)

Palm Rest Height

~50 mm

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