The Noise Shirt

The Noise Shirt is a machine washable, wirelessly rechargeable garment that measures ambient sound via an LED equalizer bar on the chest. 

An embedded microphone measures the environmental noise level and displays it as a vertical 5 step EQ bar, in which the top two lights represent noiselevels beyond recommended limits for hearing protection. A small lithium-polymer battery in the shirt contains a wireless recharging induction loop in the neck tab which, when conjoined with an inductive coil on the shirt's specially designed coat hanger, will recharge the shirt in about three hours. 

The next step is to add a mobile user interface to the device in order to access outside services and applications, giving it functionality beyond reminding everyone at the next Mudvayne show that they'll eventually be going deaf.

Info from EnGadget

Is Noise-induced hearing loss preventable?

NIHL is 100 percent preventable. All individuals should understand the hazards of noise and how to practice good hearing health in everyday life. To protect your hearing:

• Know which noises can cause damage (those at or above 85 decibels).
• Wear earplugs or other hearing protective devices when involved in a loud activity.
• Be alert to hazardous noise in the environment.
• Protect the ears of children who are too young to protect their own.
• Make family, friends, and colleagues aware of the hazards of noise.
• If you suspect hearing loss, have a medical examination by an otolaryngologist (a physician who specializes in diseases of the ears, nose, throat, head, and neck) and a hearing test by an audiologist (a health professional trained to measure and help individuals deal with hearing loss).

Info from National Institute on Deafness and Other Communication Disorders
Image from Contaminacion auditiva