The Lobmatic 4 Tennis Ball Machine includes a built-in random oscillator , spin adaptor and 80' remote pneumatic switch.The ball velocity can be adjusted from 25 mph to 70 mph with a ball delivery every 2.5 , 5 or 10 seconds.The ball reservoir holds 100 balls.Aluminum and ABS construction.Available either 110 or 120 V.The price is for each.