Here is another portable tennis ball launcher that helps you focus more on your game and less on other distractions. It fits in a bag, so you can take it to the court conveniently. You can program speed, angle, elevation, and other settings. The Slinger has a max speed of 80 mph. It comes with 36-ball capacity when closed.
Slinger runs for five hours on battery. Its bag has space for your rackets, water bottle, and towels too. You can carry the Slinger on your back or use its wheels to move it around with less effort.