Timer mostly used in constitution trainings, but it's field of use can vary :)
java 1.5 - Eclipse 3.4 swing application. Starting settings of application are written into settings/settings.properties - times and number of rounds can be also altered directly in application. If you want to use other sounds than defined here, just change the property file. Application can use only mp3 sounds (using jl1.0.1.jar). Below you can find default settings.
Colors used in timer: