Pentax Optio 550 5MP Digital Camera w/ 5x Optical Zoom 5 megapixel sensor for enlargements up to 20 x 30 inches 5x optical zoom plus 4x digital zoom (for 20x total) Optical viewfinder shows actual image zoom, innovative stereoscopic shooting Compatible with Secure Digital (SD) and MultiMedia (MMC) cards Powered by rechargeable lithium-ion battery(included); connects with Macs and PCs via USB port