Preskin Button is recognized not correct.

Unfortunately, the left button Preskin operate properly in any of the three phones.
Of the apps from the Play goals he is recognized only sporadically of "Keycut".
iKey, click or Xiaomi's MiKey - these apps he failed completely to serve with me.
Even if I get the phone after some time from standby, the Preskin has only the function of a back
Taken the dust cap, click one does nothing.

On the photo you see the error message I get the example of Keycut. The failure of the other apps are then similar.