A. Prices tend to be in the thousands of dollars, whether you buy or build. An alternative approach is to assemble a low cost system. For example, you can obtain an older computer that has NTSC output and connect it to a small cathode ray tube from a camera viewfinder. Be careful of the high voltages of course: 5000 volts or 6000 volts is common in small camera viewfinders. Some such complete wearable computer systems have been built for as little as $20.

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