JAXJOX KettlebellConnect® 2.0 is a six-in-one digital adjustable kettlebell ranging from 5.5-19 kg The new 2.0 version is armed with real-time performance tracking and reporting. Sync it to the JAXJOX App to track reps, volume, sets, average power, and workout duration. JAXJOX uses a proprietary machine learning algorithm to calculate a user’s FitnessIQ score. FitnessIQ keeps users informed on overall progress and keeps them motivated to reach their fitness goals. JAXJOX® uses peak and average power, heart rate, workout consistency, steps, body weight, and your chosen fitness level in the calculation.