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Two new Bluetooth headsets are meant as cellphone accessories, "the type that make white-collar executives on city streets look like the muttering deranged," but David Pogue has found a much cooler use, he writes in the New York Times. SoundID’s SM100 and Callpod’s Dragon V2 easily convert to "secret-agent two-way radios."

Tiny and light, both are designed to fit inside the ear canal. Pogue clearly prefers the Dragon V2, which has a range of about 250 feet (to the SM100’s 30 feet). Either device lets you communicate with a buddy on a bike ride or mountain climb. "It feels natural and creepy at the same time," Pogue writes. Best of all, inter-headset communication is free. Impossible mission, anyone? (Read more radio stories.)