EM emitter

An EM emitter was a hand-held device used for the focused projection of electromagnetic radiation. They were used by Starfleet in the 22nd century.

In 2152, when several members of the crew were captured by an unknown lifeform, Malcolm Reed and a security team attempted to use EM emitters to weaken the creature, as Doctor Phlox had determined that the creature was highly photosensitive. 

In 2153, Commander Tucker considered using portable EM emitters to fire sustained bursts of delta radiation at Xindi-Reptilian weapons in order to disable them, but Phlox informed him that the amount of delta radiation necessary to do that would also be extremely hazardous to humanoid life.