North Coast Medical Norco Mini Vibrator is great for scar massage, desensitization, muscle stimulation, oral stimulation and sensory re-education. Three natural silicone heads massage small muscle areas. Select the ball, spot or flat disc attachment most appropriate for the area being massaged. The cap massages broader muscle areas. Each head vibrates at 92 cycles per second with an amplitude of 0.06 mm. Included size C battery is easy to insert and remove. Not waterproof.