Got the phone call. Cordial conversation. Summary.....Zepp doesn't know much about the swing....let alone the high level swing.

Red segment represents contact....not speed. The ENTIRE red segment....from beginning to end.....represents contact even though the ball is only on the barrel for 1/2000th of a second.

Vertical Angle represents whether you hit the ball before or after the center of the plate. Negative = Before. Positive = After. Using the plate as the standard is a huge mistake.

Horizontal Angle represents your barrel's path into the ball. Negative means 'up through'. Positive means 'down through'.

The device....as is....is worthless to hitting instruction.

They promised improvements.

I told them they'd have a very useful product if they could teach it to map the high level swing. Early speed. Deep whoosh.

I offered to help.