Describe: 1.) This is a model suitable for beginners to advanced players, simulating over 90% of ball feed courses. 2.) The longest distance of the serve is 16 meters, the maximum height of the high pressure ball is about 8 meters, and the shortest distance of the hand thrown ball is 1.5 meters. 3.) Elevation angle Frequency Swing Topspin Backspin Continuously changeable speed range from 10 to 50 km/h, which varies depending on the softness and hardness of the ball. Specification: Frequency: 1.5 to 10 seconds/ball Altitude range: 20-70 Battery life: 2 to 4 hours Control mode: remote control/app. Charging voltage: 110-240V Speed: 10-60KM/H Remote control distance: 10-12M Battery properties: 24V5AH Ball capacity: 50 pieces (not included) Weight: 10 kg Product size: 50*36*30cm The product includes: 1 x tennis ball machine