The displays used in handheld devices are similar to those used in notebook computers. They are backlit LCD (Liquid Crystal Display) screens, touch-sensitive for operation with a stylus. The size of the display varies from model to model, but is normally around 320 x 240 pixels. Models are available in monochrome, grayscale, and color. In addition, not all displays can be adjusted in the same manner. Some allow you to adjust only the brightness or contrast, and some allow you to adjust both. Some displays are illuminated from behind by a backlight, and others possess a light illuminating the display from the front.
Most of us prefer displays in color, for the simple reason that it can be much more pleasing to look at. However, color displays do not come without downfalls. Usually, color models are a bit more expensive than those with monochrome or grayscale displays. In addition, the color display requires more power to operate, thereby significantly reducing the operational battery life on the handheld. Do you greatly prefer the look of a color display? Is color important for your needs -- will you be working with data, such as presentations or graphics, in which color plays a major role?
Processors used in handheld devices vary widely depending on the manufacturer of the device itself. You'll find a wide range of processor names and speeds, which aren't as easily discernible as desktop processors. Pocket PC handhelds typically use processors in the hundreds of MHz, which allow for the standard inclusion of color displays, multimedia options, and desktop-like software applications.
At the same time, the higher processor speeds increase the size and weight of Pocket PC handhelds and reduce the operational battery life. But if it's processing power that you need, as many business professionals do, Pocket PC is the way to go.
When it comes to memory, Pocket PC devices differentiate between two types of memory: RAM (Random-Access Memory) and ROM (Read-Only Memory). The ROM, usually 16-32 MB, is where the operating system is stored and operated from, not freely available to users. The RAM, usually 32-64 MB, is fully available for user storage, including data, applications, and the like.
If 32-64 MB of memory strikes you as skimpy, remember that applications that run on Pocket PC and other handheld devices are designed to require less memory so they can run on a smaller system. Unless you plan on storing lots of graphics from Web pages, or a fair amount of audio files, 64 MB should be more than enough for you to install and run a large number of applications.
However, if the memory included is not enough to suit your needs, most models come with expansion slots that allow you to increase the amount of available memory. The types of expansion slots vary from model to model: Compact Flash, Memory Sticks, MMC (multi-media card), and SD (secure digital) are all available, each with its own specifications.
The third most important attribute of a portable device is of course its battery life. Although various models are available that use standard replaceable batteries, the majority of current models have rechargeable lithium batteries. As you may have guessed, more powerful handhelds with more bells and whistles have much shorter operational times before you must recharge the batteries. If you always have a charger on hand and are into the habit of constantly recharging your handheld, this may not be an issue. The bottom line: rechargeable handhelds are a must.
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