When using a camera with built-in memory, once the camera is full you have to download images to a computer. Infrared transmission is usually much slower. Removable storage choices are CompactFlash cards, SmartMedia cards, floppy disks, memory sticks, CD-Rs, PC cards, and IBM Microdrive disks. Most digital cameras come with built-in flash. Automatic senses when to flash according to lighting conditions.
Digital cameras require rather frequent battery replacement.
Some digital cameras use rechargeable battery pack or even come with an AC adapter. With LCD viewer, you hold the camera at arm's length in front of you. LCD screen also lets you view previously stored pictures, but it can drain the batteries and it may not update as fast as necessary for photographing fast-moving objects. The length of camera's lens determines what part of the scene will be visible. Less expensive models usually offer fixed lenses.