Comfort and Ergonomics

Logitech MX Revolution Mouse
eople are spending more time at their PCs than ever before. Hand and arm movements are repeated hundreds, perhaps thousands of times over the course of a day as people write and edit documents, scan spreadsheets, search the Web, create playlists, browse photos, send e-mail and instant messages, and play games. A recent Logitech study revealed that in an average eight hour day, people have six applications open on their computers at any one time and the active window switches or new windows open every 50 seconds. The average user will also spin the mouses scroll wheel 26 feet in a given day. The right mouse can make an enormous difference in comfort. Advanced navigation features can economize the amount of finger and hand movement needed to get to the proper point in a document or Web page. And the slightest differences in shape, texture, support and hand positioning can make a dramatic difference over time. Touch a mouse once and you may not notice these differences; hold it for eight hours a day, seven days a week, 365 days a year and you certainly will. Because having a comfortable mouse has never been more important, the Logitech MX Revolution cordless laser mouse enhances peoples comfort and reduces the amount of movement, effort and strain needed to navigate on the PC. It features dramatic contours, subtle curves, breakthrough navigation technology, and a design rooted in ergonomic principles.
Sizing the mouse for range of hands
Before Logitech designed the MX Revolution mouse, members of the product development team worked closely with ergonomics experts to study and understand the complexity of the human hand. Part of that process included identifying hand and finger dimensions of the target customer: the adult male. The most complete study of its kind, "Hand Anthropometry of U.S. Army Personnel" (U.S. Army, 1991) chronicles a range of male hand dimensions that Logitech used to define the shape and size of its new mice.
The arc length of the MX Revolution (shown above) the distance from where the base of the typical index finger (second digit) and third finger rest to edge of the mouse keyplate is 82 mm. According th to a study of male U.S. Army personnel, the 90 percentile index finger length is approximately 81.6 mm. Also factoring in that the pad of the fingertip is approximately 8-10 mm from the fingertip, the MX Revolution provides more than enough length to support even very long fingers.
Logitech Innovation Brief: Comfort and Ergonomics in the MX Revolution Mouse Page 2
Factoring in measurements was step one. But because of the complexity of the human hand and its 27 bones, Logitechs engineers and designers knew that simply relying on a study about hand sizes wasnt enough. The company put models in the hands of a wide variety of computer users, ensuring that the vast majority of hand sizes would be able to use the mice comfortably.
A relaxed, natural hand position
Most computer mice are flat on the top, and to use them, the forearm and hand are twisted so that the palm faces down, parallel to the tabletop surface. In what is referred to as a pronated position, this flat hand angle is unnatural and requires effort to maintain which isnt noticeable in the short term, but over a long period of time can lead to discomfort. The MX Revolution mouse was sculpted with a shape that slopes from a users right to left allowing the hand to take a more handshake-like position. These slopes enable the mice to deliver more natural, comfortable hand positions that result in less strain.
When a hand rests on the MX Revolution (shown above), it angles slightly toward a handshake position a more comfortable, relaxed position. Below, the fingers and wrist are more level on a typical mouse, a position that requires more effort to maintain.
Minimizing Wrist Extension, Finger Flex
To use a mouse comfortably especially over a long period of time its important to minimize the amount of wrist extension and finger flexing. Logitech designed the MX Revolution mouse with a low profile (at its peak, the MX Revolution mouse is 42.9 mm tall), which helps keep the angle of wrist extension of most hands under 15 degrees. To ensure that users can reach and engage the mouse controls without excessively flexing their finger joints, Logitech carefully places the controls according to hand position. For example, when the index finger is on the scroll wheel, the thumb should naturally come to rest on or near the controls located on the side of the mouse. In the case of the MX Revolution, these controls include the thumb wheel (used for zooming in and out of photos or navigating through open windows) and Forward and Back buttons. Logitech positions mouse controls so that most hands can engage those controls with the knuckle joint flexed no more than 45 degrees.

With a height of only 40.9 mm tall (at its peak), the VX Revolution mouse minimizes the wrist extension of users.

Dramatic thumb scoop

Logitech sculpted the MX Revolution mouse with a dramatic scoop that supports the thumb and eases the stress on the thermor muscle (the large pad-like muscle just below the thumb). Most mice require the extra effort needed to hold the thumb against the side of the mouse. A 26 mm ledge offers support under the thumb so that it can grip the mouse in a relatively relaxed state. The thumb scoop also makes it easier to grab and move the mouse.
The MX Revolution mouses dramatic thumb scoop provides support for the thumb. It also features a rubber grip pad and a sharp edge at the top that make it easier to pick up and move the mouse.
Logitech Innovation Brief: Comfort and Ergonomics in the MX Revolution Mouse Page 3

Small scroll gap

Logitechs MX Revolution mouse has an extremely narrow gap (22.5 mm) between the wheel and the left and right keyplates. As often as people use the scroll wheel, this smaller gap reduces the distance a finger must travel to engage the wheel which over a long period of time can result in a significant reduction in exertion. The smaller gap also allows Logitech to deliver larger keyplates, making it easier to hold the mouse and engage the buttons from a wider range of positions.
Overhanging, lipless keyplates for large hands
The Logitech MX Revolution mouse accounts for very large hands with a design safeguard. By eliminating the lip edges from the keyplates on the mice, long fingers that overhang the keyplates can still push and activate the keys. Other mice that have lips around the front of the keyplates prevent overhanging fingers from being able to click the buttons.
Defining optimal button tension
The amount of force required to press a mouse button and trigger an action can make the difference between a good user experience and a frustrating one. Too much actuation force in a button requires extra exertion, and too little can result in accidental action that makes navigating on the computer more cumbersome and unnatural. Logitech carefully evaluated the position and purpose of each button before determining the appropriate tension. Frequently used buttons such as the main left and right keys on the mouse have the lowest amount of actuation force so that over time people dont exert as much effort to trigger the buttons. The thumb wheel on the MX Revolution mouse is a good example of a button that requires a higher force in addition to rotating forward and back, the wheel is also a button that can be pressed down (by default, a click of this wheel will return the view of an active window to 100 percent). The actuation tension of this button is 320 grams, three times the amount of most buttons.

Neither the VX Revolution nor MX Revolution (above) mice have lip edges in front of the keyplates. Someone with long fingers that hang over the keyplates can still press down and engage the buttons.

MX Revolution

Button
Right key Left key One-Touch Search Thumb middle Forward key Backward key Tilt right (wheel) Tilt left (wheel)
Force range 80g (+/-35) 80g (+/-35) 100g (+/-40) 220g (+/-80) 90g (+/-40) 90g (+/-40) 100g (+/-50) 100g (+/-50) 320g (+/80)

Ultra-smooth glide

The mice include low-resistance Polytetrafluoroethylene (PTFE) feet that allow the mice to glide across a surface with less resistance than with typical mice. The reduced resistance means that the amount of energy required for each movement of the mouse is decreased. When someone moves the mouse thousands of times a day, this added glide can add up to a lot of saved exertion. And with less resistance, its also easier to navigate to a precise point on screen mice with traditional feet tend to stick periodically and skip on-screen, requiring a corrective motion to navigate to the intended place.

Middle button (wheel)

Dpannage

Resoluo de problemas O rato no funciona. 1. Verifique se o rato est ligado. 2. Verifique a ligao do micro-receptor. Tente introduzir o micro-receptor em outra porta USB no seu computador. 3. Talvez seja necessrio carregar o rato. Quando todas as luzes do LED ficarem verdes, o rato estar totalmente carregado. (Quando uma luz do LED ficar vermelha, coloque o rato novamente na unidade para recarregar.)
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Resolucin de problemas El ratn no funciona. 1. Asegrese de que el ratn est activado. 2. Pruebe el funcionamiento del microrreceptor inalmbrico en otro puerto USB del ordenador. 3. Puede que sea preciso cargar el ratn. Cuando todos los indicadores muestren una luz verde, es seal de que el ratn est totalmente cargado. Si se enciende alguna luz roja, vuelva a colocar el ratn en la estacin de carga.
La souris ne fonctionne plus. 1. Assurez-vous que la souris est sous tension. 2. Vrifiez que le microrcepteur est bien connect; branchez-le sur un autre port USB de votre ordinateur. 3. La souris est peut-tre dcharge. Lorsque tous les tmoins LED sont allums en vert, la souris est totalement recharge. (lorsque les tmoins LED deviennent rouges, placez nouveau votre souris dans sa station pour la recharger).

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in your hands, wrists, arms, shoulders, neck, or back, see a qualified health professional. For more information, please read the Comfort Guidelines located on the Logitech web site at http://www.logitech.com/comfort, or on the Logitech Software. International Standards and Safety. This optical device complies with International Standard IEC 60825-1: 2001-08, Class 1 Laser Product, and also complies with 21 CFR 1040.10 and 1040.1, except for deviations pursuant to Laser Notice Nr. 50, dated July 26, 2001: 1) Emission of a parallel beam of infrared user-invisible light; 2) Maximum power of 716 microwatts CW, wavelength range nanometers; 3) Operating temperature between 0C (32F) to 40C (104 F). CAUTION: This optical device has no serviceable parts. Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure. Safety and Usage Guidelines. 1) Do not point infrared beam at eye. 2) In the absence of proper operation and if customer-initiated troubleshooting is unsuccessful, switch off device and call Logitech technical support. 3) Do not disassemble your product or expose it to liquid, humidity, moisture, or temperatures outside the specified operating range of 0C (32F) to 40C (104 F). 4) If your product is exposed to out-of-range temperatures, switch it off and allow the temperature to return to the normal operating range. End-of-life Battery Disposal Instructions. This device contains an internal, lithium-ion rechargeable battery that is non-replaceable. In general, the life expectancy of such batteries is dependent upon usage. Heavy daily use will result in shorter battery life. Casual use will extend battery life. If you suspect that the lithium-ion rechargeable battery inside your device may be drained (has a low charge), try charging it. If the battery does not recharge after several attempts, it may be non-operational. Should this be the case, you will need to dispose of your device in accordance with the laws and regulations in your area that specify the proper disposal of non-functioning electronic devices. If there are no such laws or regulations, please dispose of your device in a waste bin for spent electronic gear. CAUTION: The battery used in this device may present a risk of fire or chemical burn if mistreated. Do not disassemble, expose to heat above 70 C (158 F), incinerate, or immerse in water or liquid of any kind. Do not use or charge the battery if it appears to be leaking, discolored, deformed, or in any way abnormal. Do not leave your battery discharged or unused for extended periods of time. When the battery is misused, it may explode or leak, causing burns and personal injury. If the battery leaks, use normal precaution and discard it immediately following the laws and regulations governing battery disposal in your area. Remember that a leaking battery can cause skin burns or other personal injury. Keep this and all batteries out of the reach of children. Power Supply Warning. The power supply for this product is for indoor use only. Use the power supply that comes with your product; do not use any other power supply. Do not use a damaged power supply or attempt to repair one that is damaged. Do not immerse the power supply in water or subject it to physical abuse. Inspect the power supply regularly for damage to its cable, plug, and body. Compliance and UL Testing. Your product is UL tested and should only be used with other UL listed devices. Your product is FCC and CE compliant. For compliance information, go to http://www.logitech.com/compliance. Warranty. Your product comes with a limited warranty. Refer to the software help system for more information.