The DEUCE is great for practicing 2-shot combinations such as a volley followed by a lob OR topspin followed by backspin. The Shot Delay feature allows the player time to return to the baseline after going to the net at the end of a drill. You can purchase this machine now and buy upgrades later that turn it into the the iGENIE or use it with your iPhone or iPad. Features: 2 Distinct Programmable Shots 1 Shot Delay Upgradeable and Interchangeable (Works with ALL Controllers) Holds 300 Balls Variable Topspin and Backspin 7 Position Programmable Electronic Direction with Programmable Random Variable Electronic Height User-friendly Controller SERVE LIFT Friendly 2 Function Remote Control (On/Off with drill reset) 3 Year Limited Parts Warranty Playmate Tennis Equipment PLAYMATE-DEUCE