The screen should be easy to read in varying shades of light, including daylight. After all, if you can't see characters on your display, you might just as well be looking at a slab of wood. Fortunately, most handheld devices have backlit screens that increase the sharpness of characters and icons. Screen resolutions will vary according to the platform. Monochrome screens display images in four shades of gray, while color displays produce resolutions ranging from 120 x 160 dots per inch all the way to 800 x 600.
Higher resolutions translate into clearer images and are generally easier on the eyes.
They also might have jacks for headphones and earphones. Some can play MP3 files and other audio recordings. And almost all PDAs feature alarms . However, what you see on the Web will be determined by the size of your screen. Because big graphics are difficult to represent on very small screens, some software will display text only.