Wi-Fi is a trademark of the Wi-Fi Alliance. The Wi-Fi Certified trademark can only be used by Wi-Fi products that successfully complete Wi-Fi Alliance interoperability certification testing.
Voice Disorders. A voice disorder is when the voice has a problem with pitch, volume, tone, and other qualities. These problems occur when the vocal cords don't vibrate normally. Your voice is the sound that air makes when it is forced out of your lungs and passes over your vocal cords.
Misuse of the voice. The vocal cords can be stressed by using too much tension when speaking. This can cause problems in the muscles in the throat, and affect the voice. Vocal abuse can also cause a voice disorder. Vocal abuse is anything that strains or harms the vocal cords. Examples of vocal abuse include too much talking, shouting, or coughing. Smoking and constant clearing of the throat is also vocal abuse.