Happy Plugs Earbuds Plus provides the same great sound quality of Happy Plugs, combines it with the simplicity of an earbud, and the sound experience of an in-ear headphone, which simply makes these earbuds the best of both worlds. Control your calls and music with the built-in mic and remote. 14.2mm dynamic driver. Frequency Response 20 Hz - 20 kHz. Sensitivity 101 dB. Maxi input power 5mW.