Massager hammer our massage head integrates four innovative function: infrared ray: heattreatment :magnetic therapy and hammering massage. of infrared rays directly function on the surface of your bodyif combine with heatingthe massage result will be even apparent.powerful magnetic field can strengthen the functioning of blood vessel and improve metabolism the massage head is made of high tech engineering plastic enabling more powerful hammeringwith a step less speed adjustment device you can choose any speed you like. operation direction: Run massage hammer by ressing switch key where its indicator will be lighted. The speed of the massage hammer will be sloved down by speed reduction key. The speed of hammer will be higher by pressing speed increase key The massage hammer can be shifted between high to low limit by pressing auto key. Technological parameter : Input Voltage : AC220V 50HZ Rated power : 28Watt Use time : Fifteen Minute.