진동 장난 어플

Install the app on your friends' cell phones and play vibrating pranks!
*How to use*
1. Enter the number of seconds!
2. Press the start button to start vibrating!

*Precautions*
Once you start the vibration, the vibration will not stop until the time second has passed. Please choose your time seconds carefully!

*Tip*
Turning off the mobile phone will stop the vibration.
(Only you know!)