An universal microprocessors controlled analog scale power controlled 400 watts ESU with under water surgery. In the use of Electro Surgical Unit model 402A, the technical ability of the unit combined with patient safety are of prime importance both for the patient and the users. There must be no possibility of accidental, undesirable results in the use of such a unit. With these points in mind and the introduction of a new high frequency generator technology, the new era of Electro surgical unit have been developed. The VMD are newly developed ESU of particular safety and reliability.