This negative hydronium cold heat therapy massage stick is a new generation of hi-tech product developed basing on theory of traditional Chinesed meridians and vessels,electro biology,physics and modern microelectronic technology and in combination with abundant clinical proctces. Functions: 1.exert high-energy shake,act on human body through the massage head 2.makes the blood vessel under the muscle expand,promote blood circle 3.boost up the lymph function on the exterior body and relax the muscle 4.relieve ache of human body 5.make human loose weight by burning human bodys fat 6.make human energetic Spec: "Voltage： 220V-240V(50-60)Hz 110V-120V(60)Hz " "Shake Frequency: 3500 Transfer Rate(high speed) 3200Transfer Rate(middle speed) 2800 Transfer Rate(low speed) " "Heat Air Temperature: 50 °C (high temperature) 40 °C (low temperature) " "Weight: 1.7Kg Power: 30W " Origin China Minimum order 300pcs