For instant viewing of your images, simply put your memory card in one of the many compatible slots & view them on your computer. Power is from the USB (Universal Serial Bus) port & you also save the battery of your camera. Compatible card formats: SD, SDHC, SDXC, Micro SD, Micro SDHC, Multi Media, MMCplus, MMCmobile, RSMMC, Compact Flash Memory Stick, Memory Stick Micro (M2), Memory Stick Pro, Duo, PRO Duo & x D Picture Card.