Claimed to work at distances up to two miles, a remote-control device invented by a Californjan explodes bombs or other explosive charges. A directed, or focused, invisible beam, like a radio wave, is said to be the secret of the detonating machine. One anticipated use of the device is the setting off of enemy bombs that fail to explode, thus eliminating the risk of attempting an examination of the explosive. Another use might be in blasting, with the detonator replacing fuses and unhandy electrical equipment.