"New communications system uses 'ray guns' to transmit voices secretly and silently. Sending and receiving units are shaped like guns, which are aimed at each other for transmission. Words spoken into gun are converted into infrared radiation, transmitted to receiver. It converts radiation back to sound. Units have three-mile range."

Experimental technology apparently being tested by the ever-trustworthy Minneapolis police. Science World Scholastic magazine, vol. 2, n. 3 (1 March 1961) #raygun