When you buy a grand series machine you are buying a digital practice partner. The elite grand four is equipped with 6 pre-loaded, 6-shot drills that simulate the most popular styles of play: grinder, all courter, power baseliner, moonballer, slicer, and lefty. Practice against your nemesis with the push of a button! Included is either a 20-function physical remote control or Wi-Fi remote control for Apple. The Lobster elite grand four offers unrivaled fully random oscillation - balls are tossed throughout the entire singles court mixing up ball speed, spin, trajectory and oscillation. Equipped with 6 pre-loaded, 6-shot drills that simulate the most popular styles of play: grinder, all courter, power baseliner, moonballer, slicer, and lefty, these incredible drills made by this tennis ball shooter mix up speed, trajectory, and spin to prepare you to play against the most challenging player styles, all at the press of a button. Offering an expanded oscillation function with three versatile positional settings; narrow, medium, and wide, the grand four will sharpen your forehand and backhand ground strokes while improving your footwork exponentially. If you are looking to customize your own personalized drills and save them to the machine, consider the elite grand five. The elite grand four is made in the USA and is covered by Lobster's 2-year warranty. BENEFITS & FEATURES: Custom Drills: None Pre-Loaded Drills: Power Baseliner, All-courter, Grinder, Moonballer, Slicer, Lefty Oscillation: Random Horizontal, Random Vertical, Fully Random, Horizontal & Vertical 2-Line Function: Narrow, Medium, Wide Spin: Top, Back Elevation: 0-60deg, Electronic Power: Battery Court Time: 4-8 Hours Standard Charger: Included Remote: Includes either a 20-function physical remote control or wi-fi remote control for apple Premium Charger: Optional Warranty: 2 years SPECS: Ball Speed: 35-80 mph Feed rate: 2-9 seconds Ball capacity: 150 Weight: 44 pounds