I’m just settling in at a bar when I get a phone call from work. The football game is blaring, people are shouting, glasses are clinking—but I hit “answer” on my Bluetooth headset anyway. The HX1 completely eliminates the barroom ruckus, sending only my speech to my colleague. That’s because I can turn off its ordinary microphones, which pick up sound from the air, and instead switch on an ultra-sensitive microphone that listens just for waves conducted through my jawbone. Parked on the earbud’s inner tip, this specialized mic uses software to turn the smallest vibrations sent from my throat into a faithful reproduction of my voice. So my colleague can hear me, I can hear her (since, as on other headsets, the speaker sits in my ear) and, best of all, she’ll never know I was talking business over a martini.