"The Socket Mobile S840 is a fast-scanning 2D/1D imager barcode scanner with Bluetooth wireless technology. Small, thin and easy to use, the scanner is optimized for attaching to mobile devices, enabling one-handed operation. The S840 can scan barcodes printed on labels or displayed on device screens. It reads all the most popular 2D/1D barcodes and is perfect for retail point of sale, inventory management, sales order entry, field service, and other mobile business applications. Approximately the same size as a credit card, measuring less than 1/2 inch (1.27cm) thick and weighing less than two ounces, the S840 is one of the smallest and lightest barcode scanners available in the market today. The S840 slips neatly into your pocket and fits comfortably in the palm of your hand when attached to a smartphone. "