As a general rule, nearly any PDA will be a wireless PDA. The differences are largely a matter of what kind of wireless system is used by the device. Infra-red, Bluetooth and WiFi are the most commonly used.
Infra-red was the main method used on the first generation of wireless PDA. While this technology is still occasionally used, most modern PDA’s use Bluetooth technology instead. Bluetooth offer’s a larger range of communication and does not require a direct line of site.
However, when most people think “wireless PDA” they are generally thinking of WiFi technology. WiFi has the advantage of being a wide area network (WAN), which means that it can be used for both exchanging information as well as gaining access to the internet. Most of today’s PDA’s offer this technology. Check out wireless cameras at tomscamera.com