Acecad DigiMemo A501 Digital Notepad with Memory The digital pad can be effortlessly held in one hand or on the lap and easily operated while you are standing, sitting or reclining; includes an ultra-thin & light digital pen with a regular and replaceable ink cartridge Instantly & digitally record your notes, ideas, sketches, drawings and flowcharts, without scanning; any ordinary paper or notepad up to 5.9 x 8.3 can be used 8MB Built-in storage memory Uses 4 AAA batteries (providing up to 100 hours use with alkaline batteries) Expandable storage capacity by an optional CompactFlash (CF) memory card