Union Business Use Medical Equipment Manufacturing Union Medical Industry Co., Ltd. Hot Pack - 3 units New, unused items, but they are over 20 years old. Please understand this before purchasing. Effects: Improved blood circulation, improved nutritional state of tissues. Relief of muscle tension (e.g., stiff shoulders, lower back pain). Pain relief by eliminating substances that induce pain. Opened for power-on confirmation. Operation was confirmed to be without problems.