From Walmart:

A stylish ball pen, with massage function in its rubber capped end.

Operated by battery. The motion of this massage pen relieves fatigue, stress, headache, and motion sickness. Believe it or not, massaging on a spot above stomach area helps digestion. It improves appetite if you have this good problem, and relieves anxiety. Long term use of this product helps to improve insomnia symptoms, it can relieves wrist pain and shoulder pain, and helps to improve eyesight and complexion. An acupuncture chart is provided with the product. But of course, you can use it as a regular ball pen.