- JBL Pure Bass Sound delivers powerful audio with punchy bass from custom 40 mm drivers- You'll get up to 76 hours of non-stop listening, and a quick charge gives you another 5 hours- Two beamforming mics give you clear, focused calls with reduced background noise- Custom EQ presets on the JBL Headphones app let you tailor your sound- Switch between two devices easily with multi-point pairing