https://www.cnet.com/news/smart-kettlebells-will-get-you-in-shape-at-ces-2019/

The coolest part is the adjustable weights. Press the plus or minus buttons to change the weight in 6-pound increments from 12 to 42 pounds. Watch the weight increments adjust on the display. 

The related app helps you track your reps and can even help you customize your workout.