The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
From Jure Lajlar:
Hearcules measures the noise you are currently exposed to, notifies you when you should take a break and helps to save your hearing.It was created for musicians, people who attend concerts, work with loud machines or for anyone, who is often exposed to loud noise.Hearing loss can result from damage to structures and/or nerve fibres in the inner ear that respond to sound and don't grow back once damaged. This type of hearing loss, termed noise-induced hearing loss, is usually caused by exposure to excessively loud sounds over an extended period and cannot be medically or surgically corrected. An estimated 17% of adults between 20 and 69 have suffered permanent damage to their hearing from excessive exposure to noise.