This app can control the car after you connect the transmitter to the audio jack of Android. This application has 4 parts:1. On the left of screen: This is car's throttle, it can control the car by move forward and back the car when you move backward of it.2. On the right of screen: This function can control car's direction, you just need to move it to turn right or left.3. On the upper center of the screen: (1)You may turn on/off the turbo to control your car.(2)You may press the rotate to rotate your screen.4. Down the center of the screen: (1)You may turn on/off the g-sensor to control your car.(2)You may press the power to turn on/off controller.