["Checks for light, if theres no light it checks for the proximity." , "If theres is no light and the proximity sensor detects the proximity distance is lower then 1 centimetres it turns off the screen, If it detects light and the screen is off the screen will turn on." , "Pick sounds for (un)locking the device, also you can choose for vibration feedback."]
Ambient light and proximity sensors.
Runs 20 blocks.
So no premium needed.
Questions or problems? Comment them down below. (In English)