Unless you've got a professional coach on hand, it can be tricky to determine how good your tennis skills really are -- simply not slamming the ball into the net doesn't count, unfortunately. But for those looking to up their game, sport sensor creat...from Engadget RSS Feed https://www.engadget.com/2017/08/30/zepps-tennis-sensor-now-includes-a-highlight-camera/
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