Trucks have the problems of frequent braking and long-term braking during long-slope transportation. As the temperature of the traditional eddy current retarder is as high as 500 °C during braking. the braking torque of the retarder is seriously degraded. According to the principle of eddy current braking and current thermal effect. https://www.roneverhart.com/Open-Box-Apple-Watch-Series-6-GPS-Cellular-40mm-Space-Gray-Aluminum-w-Black-Sport-Band/