It's a connector device that works based on muscle memory. Traditional connectors are designed to keep the elbows spread by a bar type assembly locking the elbows in a fixed spread position. The drag buster is different in that it forces the batter to use muscle to maintain the spread. It has an elastic band that pulls the arms together. The batter must now use muscle to keep the correct posture. After a few dozen cuts with it on, it's automatic. The batter now goes right into the correct posture without any thought, due to the newly found muscle memory established. It's like magic on a long casted swinger! After one lesson the kid looks completely different.I saw that... But they have no video or explanation for it. How to use it and so forth.
I use both connectors as a part of our routine.