This is the free version of Crank Round Timer. For .99 cents, you get the following extras:
-No advertisements
-Random round times feature
-Separate round and rest playlists
-Ability to set the "Start Warning" to only play before first round
Search for Crank Round Timer in Paid apps.
APP DESCRIPTION: Crank Round Timer is a Timer designed for circuit training, boxing, and any other forms of exercise that alternate between periods of work and rest. It allows the user to customize the number of rounds, round time, rest time, and more. Most settings can all be modified while the timer is running. All settings and the timer state are saved when the app quits. Crank Round Timer also provides customizable sound effects and it interacts with an existing or customized iPod playlist which plays while the timer runs. The music volume decreases to a customized level during a rest period. Recording sounds is possible on the iPhone and iPad but not available on the iPod touch.