Thread, activity class Bundle class and xml file are used in the project. This projects is about converting the impact user will enter a speed in km/h and the aplication will conver the impact accordingly. Bundle class is used to save data from one activity then will be extracted to the next activity. Thread is use in the splash screen, to pause the program for a period of time give the use a feeling of the program is loading using the splash screen. Thread also used in play and pause music function within the application.