Nokia E52 support

Select Menu > Ctrl. panel > Settings > General > Personalization > Notification lights.

When you miss a call or receive a message, the scroll key starts blinking to indicate the event. To set the blinking time and which events you want to be notified, select Notification light.

When you do not use the device for a certain period of time, the scroll key starts blinking slowly as if it was breathing. To turn the breathing light on or off, select Standby br.light > Breathing light.

To lock (or unlock) the keypad manually in the home screen, press first the left selection key and then the right selection key. Or press the power key briefly, and select Lock keypad.

The keypad of your device locks automatically after the keypad autolock period. To change the autolock period go to Menu > Ctrl. panel > Settings > General > Security > Phone and SIM card > Keypad autolock period. 

When the keypad is locked, you can still answer incoming calls and make calls the official emergency numbers programmed into your device.

Note: With the Nokia E5-00, the power key is the same key as the End key. When pressing the end key inside an application, it will cause the device to go into the homescreen, instead of the usual options to change the profiles and lock the device.