It stimulates muscles through low frequency waves. This dual-channel electronic massager can work two muscle groups at a time. Great home remedy for easing aches and pains. It works with 9 kinds of vibration massage modes, 6 kinds of low frequency modes , with 21pieces of treasure infrared magnet beads , and a 3- 5-15-minutes timer. It can create micro magnetic field.It combine computer proceeding frequency vibration massage and low frequency bioelectricity impulse treatment. Easy to use. Instruction manual included. In retail packaging.