There are no needles involve so there is no skin piercing. Simply press the pen onto affected areas and it will release an electric pulse to stimulate the meridian and acupuncture points in your body for healing and pain relief. It has no side effects as opposed to using painkillers and other medications to treat chronic pain. It’s great for treating acute and chronic physical pain, arthritis, rheumatism, osteoporosis, sciatica, migraine, sports injuries, and muscle, joint, and back pains. It’s lightweight so you can easily put it in your pocket, bag, or pouch if you’re traveling or perhaps just going to work for a long day and need relief from your pain.