Visioneer Strobe 400 Sheetfed Scanner - 24-bit Color - 8-bit Grayscale - USB. The Strobe 400 is a duplex scanner for the busy professional who needs a fast and reliable scanning solution that can be used anywhere. Measuring only 11.6inch x 2.5inch x 2inch and weighing a mere 22 ounces the Visioneer Strobe 400 is the world"s smallest cross-platform document scanner. It easily fits on a crowded desk or in a tight briefcase. With Visioneer"s AutoLaunch technology, the Strobe 400 automatically scans documents as soon as they are inserted into the scanner. When used in duplex mode, it scans documents at only 6 seconds per image.