The handling of this app is very easy and setting it up takes less than two minutes.
On your PC
Download the program for your PC from my homepage.
Start it with Java.
If you close the program it moves into the background (you can open it in the status bar or in the tray menu again).
On your Android device
Connect with your computer.
Click on the digital clock to set a time.
Click on the analog clock to start the timer.
Click on the list in the upper right corner to choose the shutdown mode.
Click on one button at the bottom to immediately execute the action.