Digital binoculars cameras with memory expansion slot allow you to increase the removable image storage capacity of your digital bino. Digital Binoculars cameras with CF or SD/MMC memory card slots work with Windows 98/ME/2000/XP and you can even use them with a Mac or UNIX/LINUX computer if you use one of our Memory Card USB Readers/Writers & Adaptors to download pictures on your computer! We highly recommend using a memory card reader because they are easier to connect to a computer and use, faster to transfer data from the card to your hard driver.  Memory card adapters also save batteries and usually need no drivers to be installed!  Many of our Digital binocular cameras have an External Memory slot that can accept Secure Digital (SD)/ Multi-Media Cards (MMC) flash memory slot - you can always buy some additional Secure Digital (SD) or Multi-Media Cards (MMC) memory cards so you can keep taking hundreds of pictures without worrying too much about running out of space!  Bushnell Instant Replay Digital binoculars is the only digital binoculars that we carry that uses CompactFlash memory cards.