Yupiteru Speed Measurement Device Ball & Swing Measurement Device BSG-1 Basic Purchased last summer and used about 3 times in practice. I am selling it because I no longer use it. Batteries are 4 AA batteries. I will include 4 batteries that still work. (I have confirmed the operation before shipping) Feel free to ask any questions! Basically, I will lower the price at my own timing, so I will ignore comments asking for a price reduction.