The Powerbeats Pro 2 manage to pack a load of new features, like ANC and a heart rate monitor, into a smaller, great-sounding package.

Apple Inc.’s Beats unit rolled out the long-anticipated Powerbeats Pro 2, bringing noise cancellation, a heart-rate monitor and revamped design to the popular, athlete-oriented earbuds.

The Powerbeats Pro 2 ($250) was hardly a secret. Although Beats officially announced the new fitness-focused earbuds today, it has been teasing them since last September. And over the last few weeks,