Characteristic

Characteristic	Internet Appliances
Characteristic	PC	Handheld PC	Palm	Cellular Phone	Voice Phone
Can download applications	Yes	Yes	Yes	No	No
Output devices	³800x600 color & speaker	240x480 mono, gray, or color	Portrait orientation mono, gray	3 or 4 line character text	Speaker
Input devices	Keyboard, pointing device, mike	Keyboard, stylus, touch screen	Keypad, stylus, touch screen	Keypad, mike	Keypad, mike
UI metaphor	GUI, multiple windows	GUI, single window plus message boxes	GUI, single window plus message boxes, handwriting recognition	Cards[1]	Speech synthesis, voice recognition, keypad input
UI development tools	DHTML, XwingML, XUL, many more	OS specific toolkit, Java	OS specific toolkit	WML	VoxML, SpeechML, JSML
Graphics	Yes	Yes	Yes	No	No
Primary Memory, Mb	4-256	4-64	1-8	<1	None
Secondary Memory, Mb	Gigabytes	None	None	None	None
Processor speed, MHz	233-450	75-190	16-75	<=50	None

[1] A WML card is a combination of text, variables and commands that are used to display information and navigate a web on a small-format text display device. This is analogous to a small text-only web page.