Worth buying and very affordable
The instructions were a little difficult to understand, but I realized I couldn't get it to work because it was user error.  Boy does this pen work!  Start at a low setting and work your way up.  I was told by my doctor that every person feels the currents at different settings.  Once I was able to do it correctly, I could feel the therapy working.  It feels like a tense unit. I really like it.  The pen is sturdy and feels like quality material.  Good price!
Rating: 5 stars