BluemaxUSA dynamometers are the smallest, lightest, most reliable dynamometers on the planet. These power packed dynamometers have the highest viewable accuracy, best wireless communication reliability and an unbeatable warranty. Why struggle with old, heavy and cumbersome technology when you can have the state of the art technology at your fingertips. Every dynamometer is fitted with a long life wireless rechargeable battery offering up to 20,000 hrs of battery life. Battery life can be monitored from the App.