- These JBL earbuds have 12 mm dynamic drivers that serve up head-banging JBL Pure Bass sound- Speak to others and stay aware of your surroundings with Smart Ambient technology- Dual mics on each earbud means you'll be heard loud and clear on phone calls- Load up the JBL Headphones app to tweak the EQ, check your settings, or chill out with relaxing sounds- You get up to 10 hours of playback on the buds and a total of up to 40 hours with the case- Hop between music on your laptop and an incoming call on your phone thanks to the multi-point connection