51 A wireless rollerball ideal for those with motor skills difficulties. With an operating range in excess of 10 metres, it is ideal for use with groups or in the classroom to ensure that everyone can join in. Starter pack includes it-Receive. Dimensions: 18cm x 10cm x 8cm. Part of the 'Simply Works' range on page 59. The wired OPTIMA Rollerball uses durable, optical technology for precise tracking and control of the cursor. Light touch ball movement and stability make it ideal for a wide range of computer users. Dimensions: 18cm x 10cm x 8cm. Specifically designed for users with motor skills difficulties. With an operating range in excess of 10 metres, it is ideal for use with groups or in the classroom. Lightweight and robust. Optical technology ensures precise cursor control and light touch ball movement. Dimensions: 18cm x 10cm x 8cm. Unmatched precision with Marble optical technology. Comfortable design for right or left hand. ∙  Two additional buttons for easy scrolling. ∙  Fits like a mouse, works like a trackerball. ∙  Accurate and precise optical technology. ∙  Dimensions: 8.6cm x 16.5cm x 4.2cm. £159 2784 OPTIMAX Wireless Rollerball £44 3306 Marble Mouse USB/PS2 £150 4458 it-Roll Starter Pack |  OPTIMAX Wireless Rollerball |  OPTIMA Rollerball |  Marble Mouse |  it-Roll Starter Pack £109 2294 OPTIMA Rollerball USB/PS2 Four cursor speed settings, drag lock and double-click buttons and many other features allow each user to set up the product according to their individual requirements. Unique Anti-Tremor facility is invaluable for anyone suffering with tremors or involuntary muscle spasms. Dimensions: 23cm x 13cm x 13cm. Uses a 50mm control ring to manage cursor movement for precise targeting. Unlike a mouse, trackerball or joystick, no hand or wrist movement is necessary, and unlike a touch pad, the cursor does not have to be driven around the screen by constant finger movement. Dimensions: 22cm x 13cm x 4cm. Large, high mass, free running ball requires only a light touch. Easy navigation with function buttons. The fingertip control and the need for only minimal hand movement reduces wrist and elbow fatigue. Dimensions: 23cm x 13cm x 13cm. £195 1678 n-ABLER Rollerball USB/PS2 £219 6051 n-ABLER Pro Rollerball USB |  n-ABLER Pro Rollerball |  n-ABLER Rollerball £159 2296 Orbitrack USB/PS2 |  Orbitrack Alternative Keyboards and Mice Offers the comfort of a mouse with the benefits of an optical trackball. Control your cursor with a simple touch of the finger! The highly accurate Orbit Optical is as easy to use as a regular mouse, but it stays in one place, saving you valuable desk space. £25 3333 Kensington Orbit Optical Trackball |  Kensington Orbit Optical Trackball