The Tennis Tutor ProLite is a full-featured professional ball machine, yet it stands only 12 inches tall and weighs less than 30 pounds! There are four (4) Tennis Tutor ProLite Models including (1) ProLite - Basic AC. AC-powered, no oscillator (2) ProLite - Basic Battery. Battery-powered, no oscillator (3) ProLite - AC. AC-powered, with oscillator and (4) ProLite - Battery. Battery-powered, with oscillator. All Tennis Tutor ProLite Ball Machines features Five-second Set-up (the ball hopper opens in seconds - just load the balls and you're ready for action), Versatile Speed (from a gentle toss that's ideal for kids just beginning tennis, to hard-hitting groundstrokes that will challenge even top amateur players), Variable Ball Feed (from one ball every 1-1/2 seconds to one ball every 10 seconds), Start-up Time Delay (allows the player time to get to the other side of the net before balls begin shooting), Full Range of Trajectories (ball manually adjustable from groundstroke to lob), Battery Power (2 to 3 hours of playing time from built-in rechargeable batteries), smart battery charger (fully charges the battery overnight). The Tennis Tutor ProLite is backed by a three year warranty covering both parts and labor and extended warranties are available. Optional features include a Full-Court Oscillator (when you're ready to hit on the run, just flip the oscillator switch to return shots delivered randomly across the court) and Remote Control (A foot-operated remote control allows the player to start and stop ball delivery). Optional accessories include Smart/Fast Battery Chargers, External Battery Packs, Protective Covers and more.