Double tap to wake - Nexus 6P

Abilita doppio tap per riattivare (bussare) sul tuo 6P Nexus - ROOT richiesto!

Enable double tap to wake (Knock On) on your Nexus 6P - ROOT required!. It is only enables hidden kernel features. After reboot is this kernel flag set back to false. This app auto enable it after boot again. If you uninstall it, you will lose this feature after reboot again.

If you want to use this and you don't have rooted 6P, just follow this guide http://blog.cvetler.com/2016/01/how-to-root-systemless.html