골프용품: 10 Things I Wish I'd Known Earlier
https://www.evernote.com/shard/s529/sh/5ecb77a3-b19c-48d6-8f2a-ea7ad7cab470/b392c6eb8fded76b0ea1ee4052217229
Monophonic ring tones are mainly a person Notice ringer format which is not so common nowadays. In the beginning cellular phones were only able to playing monophonic ring tones.