No more stop watch juggling - JamTimer for Roller Derby Free is here to help! An app to assist with the timing of jams and bouts in Roller Derby. This is an ad-supported free version of our Jam Timer application. It contains less features than the paid version. Features include: * Keep track of period, jam, and timeout times* App will automatically keep track of the number of jams and the timeouts taken by both teams. * Audio / visual / vibrate reminder when 10 seconds of the jam /period / timeout are remaining* Option to hold overtime jams at the end of a bout.* Preferences allow you to customize period, timeout, interval and jam time, reminder tone and/or vibrate.* App can prevent display from dimming / timing out during use.* Remaining period time can be adjusted if necessary.* Useful for practice sessions and scrimmages* App can be moved to SD card on compatible devices. Please give me your feedback and suggestions so I can make the app as useful and easy to use as possible. Thanks! A paid version of the app is also available with the following additional features:* Team names can be customised* App can be configured to automatically switch on flight mode when the app is launched, and switch it off when the app closes.* Timer background can be customized. Add your League's logo, team photo, or any image you like.* App can prevent accidental closure of the timer when pressing the back key.