Engadget - Who knew that smartphone owners were suddenly such temperate drinkers? Just days after Alcohoot unveiled its take on a phone-friendly breathalyzer, Breathometer is here with its own way to watch our tipsiness. The namesake, FDA-approved gadget will plug into the headphone jack of an Android or iOS device and warn if our blood is too alcohol-rich, all while staying small enough to fit on a keychain.