Zepp went to 2nd generation model for tennis, and I presume that version has better software support. But on this one, the bluetooth will not stay connected. The app crashes constantly. I could not find Zepp 2 anywhere so I thought I would try the original. Wasted my money.
i think it's a good sensor to track my service tech, a few errors on forehands n backhands n slice-shoots. After all, it's a valuable tool to data your game.