Libratone's adjustable noise cancellation has been available for a while if you've been willing to plug in or wear over-ear cups, but what if you prefer wireless earbuds for your fitness sessions? You're set from now on. The Danish outfit has introduced Track+ Wireless In-Ear Earphones, which let you dial out external sounds while remaining relatively discreet. As with Libratone's earlier models, you have four levels of cancellation that dictate how much outside sound gets in: You can let in a lot of it if you're running outside, or shut it out entirely if you're commuting on a noisy subway car. You can also use the microphones to amplify external sound if you want to hold a conversation or listen for worrying noises without removing your buds.