This app can control SPL 995i helicopter after you connect the tranitter to the audio jack of Android phone. This application has five controls: 1. On the left side of the screen: This is helicopter's throttle, it can fly the helicopter in the air by move forward and land the helicopter when you move backward of it. 2. On the right side of the screen: This function can control helicopter's direction, you just need to move it to up, down, left or right. 3. On the bottom of the screen: You can use this trimmer to adjust the helicopter to left or right when the helicopter is keep rotating in the air. 4. On the center of the screen: Press "On" to start the controller; press "off" to turn off the controller. 5. On the upper right corner: You may turn on/off the g-sensor to control your helicopter.