Lobster Sports &ndash; Elite Grand Four &ndash; Battery-Powered Tennis Ball Machine &ndash; Grinder Drill &ndash; Six Pre-Loaded Drills &ndash; Fully Random Oscillation &ndash; 2-Line Feature &ndash; Translucent Hopper &ndash; 150-Ball Capacity SIX PRE-LOADED DRILLS: The elite grand four includes 6 pre-loaded drills that simulate the main styles of tennis played in the modern era. This digital, robot-like tennis ball machine makes you feel like you are playing against a pro. FULLY RANDOM OSCILLATION: This battery-operated tennis ball machine has been programmed to mix up ball location, speed, spin, and feed rate to present a true challenge for tennis players of all experience levels. 2-LINE FEATURE: The elite grand four includes narrow, medium, and wide settings, allowing for alternating of forehand and backhand strokes. It also features tennis ball speeds ranging from 35 to 80 mph and elevations from 0 to 50-degrees. TRANSLUCENT BALL HOPPER: Lobster Sports builds high-quality tennis ball machines. The elite grand four has a 150-capacity translucent hopper to allow you keep track of how many balls are left and plan your tennis training sessions accordingly. OPTIONAL ACCESSORIES AVAILABLE: You can purchase many accessories separately on Amazon to enhance the elite grand four, including the grand 20-function remote control, grand remote for Apple, or grand remote for Android.