2X MORE POWER! Our most powerful, most versatile TENS unit is still easy to personalize and customize. When you have those hard to reach, deep pains that just keep coming back, choose the Max Power Relief. It is perfect for multiple adult family members where one may have a pain in the lower back and another may have recurring knee and shoulder pain. This highly customizable TENS unit has modes to reach most of your pains. Take it to work, use at home or while travelling.