Portable scanner W520 is good for scanning documents, books & pictures up to A4 size. It is easy to use with the built-in realtime Scanning Detector to avoid distortion, and over-speed alert to control scanning speed. 600 or 300 dpi, color or monochrome scanning option is provided. JPEG files can be saved directly to your micro SD or to your computer via USB port. It supports Windows 7 / Vista / XP and Mac OS10.4 or above without the need to install a driver. Built-in display shows the selected resolution, remaining battery life, and memory status. Powered by 2 x AA batteries, that can approximately scan 200 pages. Hold the document firmly by one hand. Place the scanner on the start-scanning position. Hold the scanner tight and press the scan button once. Slide the scanner slowly and keep your hand stable to get the best quality picture. Press the scan button again to stop scanning. Major Features 1. Portable scanner 2. Scanning resolutions: 300 to 600 dpi 3. Supports MicroSD card of up to 32GB 4. 2 x AA batteries 5. Driver free to download for MS Windows 7/Vista/XP and Mac OS10.4 or above (direct plug-in, driver installation not required) Detailed Specs Image Sensor: A4 Color Photoelectric Sensor Scan Resolution: 600dpi / 300dpi Storage Format: JPEG Scan size: A4 (216mm) Scan speed: 13 seconds - Color high resolution 6 seconds – Black and white high-resolution 3 seconds -Color low resolution 2 seconds - Black and white low-resolution Storage volume: (based on 2G TF card) High-resolution - 400 pages Low resolution - 1500 pages Storage medium: MicroSD / TF card (up to 32G) Transmission mode: USB2.0 Power Supply: Battery (2pcs AA battery) Auto power off: 3 minutes without operation automatically Product Size: 227mm * 20mm * 20mm Weight: 50g