Features - 1.This knee pad adopts advanced far-infrared technology to achieve rapid heating.Black Type - 5 levels of heat temperature adjustment (40°C, 45°C, 50°C, 55°C, 60°C), Gray Type - 5 levels of heat temperature adjustment (45°C, 50°C, 55°C, 60°C, 65°C).2.We have thoughtfully designed Black Type 5 levels or Gray Type 3 levels of massage intensity, ranging from soft to strong, allowing you to freely choose based on personal preferences and physical condition, enjoying a personalized comfort