Lapis Lazuli Gold Plated Electric Vibrating Facial Roller Massager 6.5" works with AA battery Material: Lapis Lazuli Length: 6.2" Vibration Frequency: 6000rpm Product Weight: 3oz / 80g Roller Size: 20x42mm AA battery is not included. Usage: Facial Roller massager is designed to help stimulate circulation, dredging the meridians to promote the absorption of nutrients, activate skin cells metabolism, promoting collagen production, and help reduce the appearance of fine lines and wrinkles. High frequency vibration technology, can reach 6000 vibrations/min. It can stimulate cells activity and relax muscle. What' s more, you can massage for forehead, face,skin under eyes, neck, cheeks.