Twitter-backed high-end headphones startup Muzik has finally released the smart Bluetooth cans it's been showing off for years. Muzik One's defining feature is what the company calls "programmable hot keys." Simply put, it's the ability to perform tasks by tapping on the headphones' ear cup. For instance, so long as you link your Spotify, Facebook and Twitter accounts to it, you can tap on a cup to start up a playlist, follow artists or share what you're listening to on social media. You can also use IFTTT recipes to give it the power to control various connected elements in your home, including the lights or your thermostat.