・Case that does not come easily clerk in the pub
・Case you cannot call a clerk , because you are shy
・Case voice wither, wheezing
When such case, if you use this app, "Ding Dong!! Ding-Dong!!", you can call a clerk! maybe...
This app is a very simple app!
If you are a Shop owner, Put QR code to the your shop !
This app makes your shop button ! LOL