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Battery life can vary from hours to months, depending upon the PDA model and its features. Most PDAs have power management systems in place to extend the battery life.

Even if the batteries are so low that you can no longer turn the machine on it will give you plenty of warning before this happens , there's usually enough power to keep the RAM refreshed. If the batteries do run completely out of juice or if you remove them, most devices have an internal backup battery that provides short-term power typically 30 minutes or less until you install a replacement. This makes backing up or synchronizing your PDA extremely important.

In addition to battery power, many PDAs come with AC adapters to run off household electric currents. A car adapter is also generally available as an accessory. Unlike the LCD screens for desktop or laptop computers, which are used solely as output devices, PDAs use their screens for output and input.

Almost all PDAs now offer color displays. PDAs vary in how you input data and commands. Some devices use a stylus and touch screen exclusively in combination with a handwriting recognition program. Using a plastic stylus, you draw characters on the device's display or dedicated writing area. Software inside the PDA converts the characters to letters and numbers.

On Palm devices, the software that recognizes these letters is called Graffiti. Graffiti requires that each letter be recorded in a certain way, and you must use a specialized alphabet. For example, to write the letter "A," you draw an upside-down V. The letter "F" looks like an inverted L. To help Graffiti make more accurate guesses, you must draw letters on one part of the screen and numbers in another part.

Letter Recognizer and Block Recognizer are similar to Graffiti and require specialized alphabets. By contrast, Transcriber recognizes your "regular" handwriting, as long as you write legibly. It is similar to the handwriting recognition capabilities found on Tablet PCs. If you can't get the hang of PDA handwriting, you can use a miniature onscreen keyboard. It looks just like a regular keyboard, except you tap on the letters with the stylus. Some of these require you to use your thumbs to type.

Each model also has a few buttons and navigation dials to bring up applications and scroll through files. If you're in the market for a PDA, the main question you should consider is, "What will I be using this for most of the time?

On the other hand, if you travel frequently and want to stay in touch via e-mail, you need Wi-Fi capability or a smartphone with cellular data service. Look for a device that easily synchronizes with the PIM software you use on your computer.

For example, if you have a Macintosh computer or you don't use Microsoft Outlook, a Palm OS device may be more to your liking. The device's data entry method is another important consideration.

If you plan to use your PDA for e-mail or other text-heavy applications, consider a built-in keyboard. If you can, try out the keyboard before you buy. The size and shape of the device and its display are also important considerations. The device should be comfortable to hold. The display size and clarity should also meet your expectations.

As with the keyboard, it's best to make a trip to a store that sells the devices you're interested in so you can try it out before you buy. If you are interested in a multipurpose device that combines features such as GPS , an MP3 player , or digital camera , look for a device that has these features integrated.

If you plan to use numerous applications or store large files, look for a device that accepts flash memory media cards. Accessories to consider include an additional battery, a car or travel charger, headphones, a carrying case, a plastic screen protector and add-on keyboards. If you're interested in a smartphone, many of the considerations for purchasing a cell phone apply. Some of the most important things to check include service providers' coverage area, the additional cost for cellular data service if any , and the length of the service contract.

Traditional PDAs appear to be less popular than they have been in the past. The emergence and gaining popularity of smart phones and devices that combine other features such as wireless Internet, GPS and multimedia capabilities seem to back this trend. PDAs are designed to work with desktops or laptops and to make the information in your bigger computers portable.

So you need to keep the information up-to-date. PDAs have features that make this easier for you. Each operating system has its advantages.