Apple has launched the Beats Powerbeats Pro 2, making them the first Apple earbuds to feature built-in heart rate monitoring.

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,

The same goes for select gym cardio equipment. If you go to a fancy gym, you may have bikes or treadmills that can connect to Bluetooth heart rate monitors, and you can press and hold the “b” button on Powerbeats Pro 2 to sync up.