Smart dumbbells have been around for a while. They can combine with your phone to track your workouts. Take the MOTAG SMRT Handweights for instance: it is an app connected weight that adds more intensity to your workouts. These can be adjusted from 2.2 to 4.4 lbs.
More gadgets like this: here
The MOTAG SMRT weight works with your phone to track your daily exercise. These have a LED display to show your reps. They have an anti-slip silicone grip. You can find out more about it here.
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