If you are seeing your MLM change from green>blue>green but no data is appearing, please see the below steps to ensure proper set up and alignment: 1. The MLM is set up on a flat surface and not angled; if you are on a slant, use the MLM case to level it to the ball. 2. The MLM is at least 6 ft behind the ball and no more than 8ft. 3. The MLM is facing down the target line in order for ball flight to be seen. There needs to be at least 8ft of ball flight before hitting the net in order for data to trigger and at least 60-80 ft when hitting outdoor. 4. Make sure no objects are obstructing the camera view of the ball. Ex. Too tall of a mat, tall grass etc. The ball needs to be in view in order to track data. 5. Ball must be in view on the screen, if you cannot see the ball on the screen, the MLM will not be able to pick up its starting position. 6. Lighting: Wither your net is located indoors or outdoors, you need sufficient lighting. This includes at the beginning position of the ball as well as the ball flight. If the initial ball cannot be seen, you will not receive data, as well if the ball flight cannot be seen, you will not receive data. A room with overhead lighting filling the room is suggested. 7. If you have a magnetic phone case, remove before using MLM.