Combine magnetic therapy with vibration massage,for hand, face and body. 4.3" x 1.0" dia unit includes a 0.4" dia 900 gauss, bionorth (-) rounded magnetic ball tip. Recommended for facial and foot neuralgias, TMJ, carpal tunnel syndrome, shoulder spasm, bursitis, arthritic joints, cranial and neck pain. Read on further uses: Repetitive Strain Lesions ADD Sciatica Made in Hong Kong. Needs a 1 AA 1.5 volt battery (not included).