This is an mp3 timer for a one stage meditation featuring a 'zen gong' chime at the beginning and the end. There is 30 seconds of silence at the beginning to allow you to get settled

and then -

Start: one chime

End of meditation: one chime at twenty minutes to signal the end of the meditation

About hanging gongs:
While theses days Zen is considered a largely Japanese discipline, it actually originated in China. In Chinese temples hanging gongs are struck 108 times as it is said that sentient beings have 108 types of worries. The teaching is that "upon hearing the gong, worries will cease, wisdom will grow."

Read detailed instructions for this meditation on the 'Meditation Instructions' page