Whats in the package: 1 X headphone , no battery and instructions included
it will work straight away when new batteries inserted
¡ñDo not leave the headphone in an extremely hot or humid place.
¡ñDo not use a new battery with an old one.
¡ñIf you dont use the headphone for an extended period of time, remove the batteries to avoid possible damage from battery leakage and corrosion.