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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 down of the screen: Press "up or down" to trimming car forward or back.2. 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. 3. On the right of screen: This function can control car's direction, you just need to move it to turn right or left. 4. On the up of the screen: (1)Press "- or +" to change gear.(2)You can Press "MT or AT" to select automatic transmission or manual transmission.