My husband surprised me by purchasing a pair of Aftershokz headphones for me. Each earphone has a little plastic tape stuck to it that you should pull off before charging or using them. Maybe if the post inches measurement will help a little next time. Now for the important part:SOUND:These headphones do very well on technicalities. Los botones, conexiones e indicadores están repartidos entre ambos auriculares:Auricular derecho:1) Botón de encendido2) Indicador led del estado de funcionamiento3) Botones de bajar y subir volumen4) Conexión jack5) Orificio para el micrófono internoAuricular izquierdo:1) Conexión de carga micro usb2) Botón de cancelación activa de ruido3) Indicador led del estado de funcionamiento de la cancelación activa de ruido? FUNCIONAMIENTO ?Para ponerlos en funcionamiento en modo Bluetooth es necesario presionar Fuera de eso, estaba muy contenta con ellos, son ligeros y cómodos. The audio even on a strong signal will sound " different "3. This version does not have the pre-drilled holes for using screws to hold it down, but that was easy enough to add with a drill or a drill press. As long as you swipe within the touch pad, this actually make things a lot easier! Read other reviews and the said sizing was small.