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Introducing a convenient and easy way for everybody to measure their rebounder routines! Keep track of the time, number of bounces, calories burned and intensity! Fits most all mini-trampoline rebounders. Each charge should last several months. Made in the USA. Well built and user friendly! No other unit uses our patent pending technology. Most are just cheap counters. Our monitor measures deflection, intensity, caloric burn and intensity. Patent Pending