Apart from processor speed, memory and screen size, some of the critical specifications that you can use for cost and brand comparisons include:

Data input - While some models have a full QWERTY keyboard built-in, you may want to consider adding a fold-up full-size external keyboard. Entering lots of text with the small built-in keypads or using the handwriting software can be frustrating.

Audio input - A built-in microphone or microphone jack is needed for recording voice memos and meeting notes and store audio files.

Music playback - MP3 audio file playback can sometimes need additional software.

GPS - While there are a number of purpose-built hand-held devices for industrial applications, your PDA's GPS capability may not be suitable for rugged outdoor activities.

Communication - Look for integrated Bluetooth 1.1 and a built-in 802.11b Wi-Fi adapter

Smartphone - Combines the functions of a mobile phone with a data management device in a single unit. Phone capability requires a separately purchased service contract

Audio Output - A headphone jack is essential for listening to your audio files

Cradle/Charger - This device allows for easy connection and synchronization with your PC while simultaneously recharging your battery. Consider buying an additional cradle for the office for maximum convenience. Some PDAs include a cable or a special cradle that provides an interface with your desktop computer to synchronize data.

Battery life - Each device will have its own battery-life characteristics. Battery recharge life is also dependant upon the data you are processing. You can use manufacturer's specifications as a guide to compare between brands and models, but these specifications are laboratory measurements and may not reflect your actual use.

Bluetooth - This wireless technology lets you to exchange data with other handheld devices or any other Bluetooth enabled device such as a cell phone, fax machine, personal computer, laptop computer, headset or printer. The Bluetooth feature will allow you to add an external keyboard.

Digital camera - PDA cameras usually capture low resolution images (around 1.2 megapixels), which are perfect for emailing but not ideal for printing.

GPS - Global positioning system allows you to navigate from any point on or near the surface of the earth.

Music/Audio - The MP3 playback quality will depend on the bit rate of the audio file and the quality of the built-in speaker. The audio quality is often better when played back through a quality headset.

PDA Screen - PDA screen sizes are measured in inches diagonally and are available from 2.6 inches up to 5 inches on the very high-end. Larger, brighter screens require more power to operate therefore increase battery consumption.

Processor speed - refers to the speed in which a PDA coordinates its internal functions. Processor speeds are measured in MHz (megahertz) and range between 4 MHz and 624 MHz. Although these specifications can change rapidly as technology develops, it is recommended to have a processor speed of at least 16 MHz for general day-to-day functions.

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