Lock Screen - Keypad Lock & Passcode is a free, highly-secure mobile app for Android devices that will keep your phone locked, even when you remove the battery or power source. Using the PIN or Password, you can unlock your phone in just a few touches. 

This is one of the most secure keypad lock screens available for Android devices. It can help protect your phone from intruders, while still being easy to use. This is accomplished through the use of a PIN, which you can set. 

If you prefer using the Password, then you can set it as well. In this case, the PIN will be displayed on the screen. 

You can quickly view your recent notifications from the Lock screen by turning on your phone.