3d bar code readers use your phone's camera to literally scan bar codes and search for products.

3d条形码阅读器通过你的手机摄像头，扫描出条形码，并能找出商品。

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There are three types of scanning devices: optical scanners, bar code readers, and char and mark recognition devices.

扫描设备有三种类型：光学扫描器，条码阅读器，和char和标记识别设备。

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They are used in broadcasting, in digital cameras, endoscopy, desktop videoconferencing, fax machines, CCTV cameras, as well as bar code readers.

它们用于广播、数码相机、内窥镜检查、桌面视频会议、传真机、闭路电视摄影机、以及条形码阅读器。

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In addition, they depend on an array of specialty devices, such as audio book-readers, color readers, navigation tools, raised Braille labels, special bar-code scanners, and large-buttoned, voice-enabled MP3 players which are prohibitively expensive.

ENGADGET: Qualcomm develops eyes-free smartphone for the blind and visually impaired, calls it Ray