WSJ asked Alex Rawlings, author of “How To Speak Any Language Fluently,” and an expert in over 15 languages, to test out the new Pocketalk S Voice Translator on the streets of Barcelona.

An curved arrow pointing right. Pilot is a smart earpiece that uses bluetooth technology to translate conversations in different languages as they are spoken. Created by Andrew Ochoa of Waverly ...

He fixed that feature-gap by building a Bluetooth to Infrared translator. The hardware he used for the prototype is quite simple. A cheap serial Bluetooth modem from eBay lets him connect to his ...