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1:the four handles on the body at the same time, and each two can be separately controlled with different energies because they require different energies to operate different parts at the same time. basically, the handles on the market can't be separately controlled; 2: our strong max.5000w output power; 3: our output frequency max.150hz adjustable and very efficient compared with market ones; 4: our four treatment handles are professional quality and removable, easy to remove and replace; 5: good radiation for system, one system integrates 110v and 220v;