Working Principle: Driver-free plug and play, scan old photos to convert them to digital files for uploading to your computer, scan color or black and white documents, PDF or JPG files and photos. No Driver Required: Driver-free plug and play, Winows7/XP/Vista/OS X10.4 or above systems support driver-free, directly plugged in, no need to install drivers. Crisp Image: Clear simulated image quality with 300DPI/600DPI/900DPI selectable resolution technology, up to 900DPI. Large Capacity Storage: Scanned images can be saved directly to the scanner's own memory card in JPG/PDF format, supporting up to 32G memory. Compact and Portable: Fits easily in your purse or briefcase, scan important documents and photos anytime, anywhere, scans an A4 file in 3 seconds, no warm up required.