I want to write a review for people to know what they be get when buy these earphone . there be no actual speaker that produce sound . it be vibration . yes they vibrate you ear , and that be what you experience . you ear shake and tickle . it take more power to operate vibrator than speaker , they be not loud at all . you be not hear music , but feel the music . in my opinion this be more of a toy then a useful device . I listen to Pineapple Rumble K Bone Conduction Headphone for about two minute and I could not take the vibrate any more . I be go to keep they just so I can show to anyone who want to see the weirdest earphone in the world . and no way they could be worth the msrp . Mabe $ 5.00 at most .