BSN Bulldog Baseball/Softball Pitching Machine Speed: 30-60 mph. Lightweight design lets you move the pitching machine around with ease. Power Source- Electric Throws baseballs, 11'' and 12'' softballs Runs on 110 volt AC or generator 1/4 HP D.C. motor Durable urethane wheel eliminates air pressure issues Heavy duty legs are convertible for baseball or softball