The Vivitar Foot Ball Massager is a tough tissue reducing ball massager with acupressure nodes— designed to help relax sore areas and eliminate tension. Improves flexibility. Cordless and handheld, this massager will give you a professional quality massage in the comfort of your own home. Uses 3 AAA batteries (not included). Contains tough tissue reducing ball massager, a user manual, and 1-year warranty card. 3 1/2 inches round.