JBL Endurance Race true wireless active earbudsFeatures & Benefits Active Noise Cancelling with Smart Ambient JBL Endurance Race 2 earbuds use Active Noise Cancelling to listen to your surroundings and filter out distracting noise. Smart Ambient lets you control how much of the outside world you want to hear, so you can talk with others or stay aware of your surroundingsall without taking your earbuds out. Ergonomic wing enhancer with Twistlock technology The ergonomic wing enhancer on the JBL