Presentation Bell KYU w/ timer is a free Android application developed by KYU, which can be a lifesaver for presenters who need to keep track of time during their presentations. With this app, presenters can set predetermined times and the app will ring a bell to remind them when it's time to move on to the next segment.

One of the best features of Presentation Bell KYU w/ timer is that it can run in the background even with the screen off, so presenters can continue using their phones for other tasks without interrupting their presentations. Additionally, the app offers several types of bell/vibration to choose from, making it accessible to a wide range of users. The low CPU use rate (0.02s) ensures that the app runs smoothly even when running in the background on Nexus 5.

Overall, Presentation Bell KYU w/ timer is a simple yet highly effective tool that can help presenters stay on track and deliver their presentations with confidence.