Keep track of the time of your speaker giving a talk. This remote controlled countdown clock allows you to control a fullscreen timer on your Android tablet or phone from any web browser. Synchronization will be immediate. Just go to www.speakercontrol.com to control the countdown timer.
The timer will adapt to any screen size and the screen of your Android device will stay on while the timer is running. Like this you can place your device anywhere in front of your speaker controlling it remotely.
You can also use the free evaluation version having in app purchases.