Timeboxing is a technique of time management which consist of allocating a fixed time period for each activity, avoiding it being completed beyond the allotted time, allowing you to get more productivity.

CREATING A PROFILE:
You will be able to create profiles with predefined values that will can be loaded to the timer easily.
From menu options in the home screen of the application, tap: Profiles>New Profile. Fill out all the fields, then click on Save.

LOADING A PROFILE:
From the profiles screen, click on a profile, then click Load.
After loaded, you will can click on the green button to start the counting.


CONSIDERATIONS:
Timeboxer is a free application, but it uses advertising for support its development. Versions no ads can be available in future but without any guarantee.
The recording of profiles has no limit, but they are saved on device storage. So, its limitations are restricted only to the available storage.

REFERENCE:
http://wikipedia.org/wiki/Timeboxing