Material Debate Timer

Features Material Debate Timer

A brand new timer for high school debates!
Complete with a prep timer accessible to every device, and display in both how much time is left, and how much time you've used.Please give me feedback on how to make the app better.
Right now, there's only a single banner ad on the homepage for slight revenue generation, but it doesn't show up when you're actually using the timers so as to not be intrusive.
Both permissions are required to make the ads work properly.
Plans for future include adding settings to allow for changing colors, saving the time of your speech.
Thanks to IconFinder and Nick Roach of http://www.elegantthemes.com/ for the icon.