This app uses the Device Administrator permission.
Permission is required to lock device with double tap.

Tap2Lock is a tool that allows to lock phone screen with double tap.

How to use?
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1) Use ON OFF button to enabledisable screen lock
2) With "Only on home screen" feature you can enable screen lock only on device home screen
3) With "Only screen center" feature you can enable double tap only in the center of the screen
4) You have to give this app Device Admin rights to enable screen lock.

How to uninstall ?
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Open phone Settings > Device Administrators > and unckeck Tap2Lock there.
After this you can uninstall.