Bowflex’s adjustable dumbbells are quite useful for folks who don’t have space for too many dumbbells but want to be able to add weight to their workout when they want to. SmartTech 560 dumbbells take it to the next level. They not only track your reps but send data to your iOS or Android device. These dumbbells have a display that show you useful information when you need it.
Just like older models, these dumbbells rely on SelectTech technology to allow you to add or remove weight when you want to (from 2 to 90 pounds). According to the company, these weights should go on sale before Christmas. A set of two weights could set you back as much as $500 though.[Source: Engadget]