Please note: This meridian pen is used to relieve the physical condition by vibrating the meridians. Therefore, the hand of the stylus will feel vibration during use. The more you touch it, the stronger the vibration. If you need to reduce the vibration, hold the pen with your palm. Happy shopping! Features: The essence of Chinese medicine, health promotion; Fusion of modern biotechnology; without piercing the skin to do acupuncture; Simple operation, easy to carry; Safe and effective, with no side effects; Affordable family use Effective for: Acute and chronic physical pain Arthritis Rheumatism Osteoporosis Sciatica Spondylitis Migraine Sports injuries Muscle & joint pains Back pain Fibromyalgia Size: 200x30mm Battery: 1 x AA battery (not included) Package Includes: 1 x Meridian Energy Pen 1 x Ball Type Head 1 x Dome Type Head 1 x User Manual 2 x Cases of gel ( no included ) The role of the gel is to relieve the irritation of the machine and skin contact, no special effect. You can use your home massage cream, lotion, aloe vera cream, etc. instead of gel, the same effect. If you have any questions, please email me, I will reply you as soon as possible to help you solve, I wish you health and happiness! Note:People whose body have Medical Device Aids are NOT allowed to use this product.