ultrasonicsprayer

Mosquito ringtone, the silent ringtone.A ringtone that cannot be heard by people around the user of the mobile phone? Very hard to believe. But that is what exactly happens with mosquito ringtone. The power of the guardians has considerably been undermined with the empowerment of the young people by using mosquito ringtones on their mobile phones.The onset of decline in hearing starts from the age of 20 and gets worse with advancing age. This condition in humans is medically termed as Presbycusis. The reality is for the aged people the higher frequency sounds are as good or bad as silence.What is Presbycusis?Presbycusis is the loss of hearing that gradually occurs in most individuals as they grow older.