The Tanita CJ688 Calorie Jump health monitor counts every jump performed & works out how many calories are burned during each session, taking into account the weight of the user for more accurate calculations. Whether you skip forwards, backwards or with a 'criss-cross' motion the device will work, & it is light & easy to use which makes workouts more enjoyable. The cord is made from strong, twist-free plastic & users can adjust its length to suit their height. The skipping tool will count revolutions & jumps up to 9999 & display calories from 1 to 4108.