The TrackMan Marble from Logitech is a space-saving ambidextrous trackball with a well-established record. Somewhat unique to the TrackMan Marble is the forward placement of the 40 mm trackball which sees the ball positioned almost at the very front of the unit. This puts it directly under the fingertips of the ring, index and middle fingers, freeing users to employ any or all of these in providing cursor control. The long Left and Right click buttons are located further back along the sides of the trackball body, providing easy access for the thumb and ring or pinky finger. Small inset secondary buttons offer web browser Backward and Forward commands. Cursor control on the Trackman Marble is very smooth and accurate, with the ball weighing enough that response is easily controlled. The weight of the ball is also great enough to enable users to "spin" it for rapid movement across large areas or multiple screens.

The narrow design of the TrackMan Marble is best suited to users with small to average-sized hands as those with larger or wider hands may tend to "pinch" the trackball in order to maintain placement. However, the length of the body and the primary buttons does mean that users with longer hands can accomplish excellent cursor control while still easily performing click actions.

Some users may find the absence of a dedicated scroll feature on the TrackMan Marble less than ideal. However this concern can to a great extent be addressed by installing and running the customization software available from Logitech which can enable the trackball to be used as a scrollwheel (on PCs) or the Back/Forward buttons as Scroll Up/Down (on MACs).

Note:Unlike many trackballs, the ball on the Trackman Marble is easily removed from the housing for cleaning.

The MX Ergo Wireless Trackball from Logitech shares many design features with the M570 Wireless Trackball. The body contours are virtually identical, with more angular lines and a metallic grey trackball to distinguish it from the M570. The differences focus on improved ergonomics and expanded functionality. The MX Ergo Wireless Trackball features a magnetic base plate on which the trackball can be angled to either 0° or 20° by a simple shift of pressure from the hand.

The MX Ergo Trackball transfers all cursor control to the thumb, which virtually eliminates arm movement when mousing. Accurate adjustable optical tracking is provided by a 380 DPI laser sensor with a thumb-activated Precision Mode button. The contoured body provides a relaxing support for the hand, naturally positioning the fingers over the right and left buttons. A rubber-coated tilting scroll wheel with crisp detents is conveniently positioned between these buttons to complete the traditional mouse control layout. The index finger has easy access to convenient Back and Forward Buttons for browsing through multiple pages of a document or web page.

The MX Ergo Wireless Trackball offers Dual Connectivity - USB via the Logitech Unifying receiver, or Bluetooth (see Detailed Specifications for compatibility details). Those working with multiple computers at a time may wish to take advantage of the "Logitech Flow" capability to connect with and work seamlessly across two separate computers.Note: As the MX Ergo Wireless Trackball places the workload fully upon the thumb, (which on most other trackballs is generally shared by several fingers), anyone who has existing thumb issues would be well-advised to consider alternative solutions.

The M570 Wireless Trackball takes most of the repetitive movements and strain which the entire hand usually must perform and allocates all the workload to the thumb of the user. Accurate optical tracking is provided by a 570 DPI laser sensor housed below the ball. With a contoured body that provides a relaxing support for the hand, the M570 is equipped with a scroll wheel and right and left click buttons, all positioned as with a traditional mouse. In addition there are Back and Forward Buttons for convenience when browsing through multiple pages.

Connection is via a storable USB mini receiver and a single AA battery can provide up to 18 months of service. A battery life indicator will advise when the battery needs replacing. Software available from Logitech enables users to customize their trackball functions and performance.

Note: As the M570 places the workload fully upon the thumb, (which on most other trackballs is generally shared amongst several fingers), anyone who has existing thumb issues would be well-advised to consider alternative solutions.

The Ergo M575 Wireless Trackball from Logitech replaces the earlier M570 Wireless Trackball, offering improved connectivity options. Like its predecessor, the M575 takes most of the repetitive movements and strain which the entire hand usually must perform and allocates all the workload to the thumb. Accurate optical tracking is provided by a laser sensor that offers 400-2000 DPI resolutions. With a contoured body that provides a relaxing support for the hand, the Ergo M575 is equipped with a scroll wheel and right and left click buttons, all positioned as with a traditional mouse. In addition there are Back and Forward Buttons for convenience when browsing through multiple pages. The trackball body is shaped to let the hand rest in a natural relaxed position. As with the earlier M570 model, the M575 is best suited to those with small- or average-sized hands.

Connection can be made via either Bluetooth or the storable USB mini receiver, with a single AA battery providing up to 2 years of service. A battery life indicator will advise when the battery needs replacing. Software available from Logitech offers customization of trackball functions and performance.

Note: As the Ergo M575 places the workload fully upon the thumb, (which on most other trackballs is generally shared amongst several fingers), anyone who has existing thumb issues would be well-advised to consider alternative solutions.

The Ergo K860 Keyboard from Logitech features a flowing design that orients keys at varying angles across the keyboard. The K860 alpha/numeric keys transition through a concave arc from almost level at the centre to about 5° at the right and left edges. The navigation cluster on the right then completes the transition to a fully flat numeric keypad. The left and right key groups are also angled or "splayed" outward to encourage adoption of a more neutral alignment of the wrists. The Ergo K860 also has an attached 3.5" deep cushioned palm support which rises up to match the keyboard elevation. This needs to be taken into consideration when deploying the K860 into a workstation.

While the K860 has a slender low profile the angled design results in the middle keys being elevated to 1.5". This elevation may require individuals to either raise their seats to accommodate the height of the keyboard or to use a keyboard tray to lower the keyboard into their lap. The keyboard is also equipped with front legs that can be used to raise the front to create either 4° or 7° negative slope intended to encourage better wrist alignment. Use of these legs may require further adjustments of seat or keyboard tray height because it adds another inch of elevation to the middle of the palm support and increases the risk of pressure points being created on the underside of the wrists.

The K860 features low-travel scissor switches with chiclet-style keycaps. Key activation is crisp and comparatively high force compared to other scissor switch devices and does require a significant degree of activation force. The low profile keycaps have a satin texture with a slight concave surface to aid in finger positioning.

The Corded Mouse M500 from Logitech is a comfortable, contoured mouse with hyper-fast scrolling for increased productivity. It features laser precision tracking for smoother tracking on just about any surface (excluding glass and mirrors) and forward/backward buttons for quickly scanning through documents or browsing on your favourite websites.

The Logitech Wireless All-in-One Keyboard TK820 for Windows provides all the technology needed to control a computer, or to input data, in a single device. Only 16.1 inches long, the keyboard includes a built-in touchpad seamlessly integrated into its compact, ultra-slim design. Whether used on the desk or on the lap, the keyboard eliminates the need for a mouse, helps to reduce the risk of overreach injuries to the shoulder, and keeps clutter to a minimum.

The touchpad measures 4.17 inches square and easily accommodates up to 13 unique Windows 8 gestures. The generous dimensions offer plenty of space to pinch, zoom, and swipe. Cursor control is smooth and precise. The key caps on the Wireless All-in-One Keyboard have concave, softly rounded edges to help the fingers move easily from key to key. The settings on the touchpad can be personalized with Logitech software, downloadable from that company's website.

A small Unifying Receiver connects the keyboard wirelessly to the PC; the robust, reliable connection allows the keyboard to be placed in the most convenient location. The unit runs on four, preinstalled, AA batteries (supplied). Spill-resistant construction helps to protect the keyboard against accidental spills of up to approximately 2 fl oz (60 ml) liquid.

Note:The keyboard is not spill-proof! Do not wash the keyboard or immerse it in liquid.

The G500 has a hard to believe 20 programmable buttons, making it arguably the most customizable mouse Logitech has ever offered. The design was inspired by the needs of MMO (massive multiplayer online) gamers who require quick access to a wide variety of programmable functions, including customizing the color of the side buttons on the thumb keywell. The mouse even features an onboard memory feature which allows the user to switch between three memory profiles on any computer (even without a driver installed). The three large primary buttons are rated at 20 million clicks, well suited for taking the heavy repetitive load that gamers will put on the buttons. A 1 millisecond USB report rate may tax the PCs communication speed but will ensure minimal lag time when performing mouse actions.

With Logitech's Performance Mouse MX you can track virtually anywhere - even on a glass desk - with Logitech Darkfield Laser Tracking. Turn the world into your mouse pad. This new mouse also incorporates the Logitech Unifying receiver - the tiny, wireless receiver that stays in your notebook and lets you add devices as you need them. Plug it. Forget it. Add to it.

The micro-USB recharging system lets you use the mouse even when it's charging. You'll fly through documents and Web pages with a single spin. Click-to-click scrolling gives you the precision you need when navigating lists, slides, and images. Designed to fit your hand and put it in a comfortable, natural position, the Performance Mouse MX also has customizable thumb buttons to help you do more, faster. Move backward or forward through Web pages, zoom in or out on photos, and jump between open windows.

Note: Although this is the recommended replacement for the MX Revolution Mouse, the revised shape makes one's hand more pronated (i.e. flatter) on this version than the old MX Revolution Mouse.

The K400 Plus TV Wireless Touch Keyboard from Logitech is a combination keyboard with built-in touchpad for typing while sitting back in a favourite chair or just surfing the net on TV. The wireless range of the keyboard is about 33 feet (10m) and features a 3.5-inch (diagonally) touchpad with easy vertical scrolling functionality. It works plug-and-play right out of the box, has an 18-month battery life, and works with many common operating systems (Windows, Android, Chrome).