【Function】: Fixed point ball, horizontal swing ball, vertical swing ball, deep and shallow ball, two line ball,cross ball, random ball, high drop ball, Topspin, backspin ball, Self programming, default ball settings, speed adjustment, frequency adjustment. 【Product Highlights】: 1. Fully functional smartphone app control (speed, frequency, angle, rotation, etc.) 2. Intelligent programming with 20 landing points, self designed different modes of serve training. 3. One click selection of 12 fixed modes for serving. 4. Choose the location of the entire venue at will, suitable for training, teaching, and competition, etc. 5. Built in large capacity imported lithium battery, real-time display of battery level, continuous use for 4-6 hours. 6. Adjust the vertical angle at 20th gear and the horizontal angle at 30th gear, and different depth ball functions can be set. 7. Random ball function. 8. Initiate 2.5s variable speed ball to meet advanced exercises.