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 arm 2. 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 arm 3. 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 immunity 4. 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