1. Helps keep the body moving - Great for physical therapy and exercise for the elderly and people with arm injuries who need motor skill therapy after a stroke. Helps promote blood circulation in the arm and strengthen the arm2. Adjustable resistance - Meet different needs. Turn the tension knob left or right to increase or decrease resistance. Low tension settings are great for rehabilitation, while high intensity helps to strengthen the arm3. A must-have for families with elderly people - This fitness equipment is great for the elderly to use, exercise for a period of time every day, strengthen arm strength and increase blood circulation, which can make the body strong and improve immunity4. Portable and easy to use - Small size, save space. Product size: 16.1 inches x 4.7 inches x 8.5 inches. Just place it on a flat surface, press the suction cup button, adjust the resistance and start exercising