Binaural Beats Free_app.com.binauralbeatsapp.com.binauralbeats_34.apk

It is a application which increase mental ability, concentration,
focus power.
for more info
http://www.omharmonics.com/blog/how-to-use-binaural-beats/
or
http://www.zenlama.com/under...-ultimate-quick-start-guide/