PES-U (Passive Elastic System-UpLimb) is a mechanical energy-storing exoskeleton developed and designed by ULS Robotics. It is specifically used to assist users with mechanical support for their shoulders and arms. This energy-storing upper limb exoskeleton product is primarily designed for physical labor positions in enterprises, aiming to reduce the labor burden of workers in lifting work. It effectively reduces the load by more than 30% and provides strong support and protection for improving production efficiency.