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Calculator is the Vault app can secretly Hide Pictures, Hide Videos and Lock Apps without anyone knowing as gallery lock installed in your phone looks as just a regular calculator. Your files will be secretly "Calculator app lock download" in vault and can only be viewed after a Numeric PIN is entered on calculator panel of this app.
Also this Photo,Video Locker can be used as regular calculator for daily use. Click on Button at the bottom of main screen and then select media from gallery and click lock button to hide into Photo,Video Locker-Calculator app.
Go to App Lock tab on main screen and Lock your Apps by selecting them to keep safe from others.
Enabling intruder selfie lets you capture intruder's photo and show them when you entering into smart hidden calculator. Instant selfie captured when someone tried wrong password on your app lock. Enable double security or fake screen over your app lock.