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What it is: KeyUp is a push-to-talk walkie-talkie app. You make a room for your crew or family, hold the button, and everyone in the room hears you, across a building or across town. Why I built it: it started on a warehouse floor. We needed to talk without stopping work, and handheld radios were always dead, missing or broken. Everyone already had a phone, and some of us had watches. What makes it different: The watch is a first-class device. On Wear OS you turn the crown to talk and turn it ba...