Zoom Telephonics was founded in 1977 as a home networking product manufacturer, headquartered in Boston, Massachusetts. The company was founded by Frank B. Manning and Bruce Kramer, two fellow roommates and graduates of the Massachusetts Institute of Technology (MIT) who had known each other since the late 1960s. The company's first product was a modification kit for telephones that turned off the phone's ringer with the flick of a switch.
Branded the "Silencer", it generated $200,000 in the first few years of Zoom's existence and prompted the founders to release more telephonic gadgets. The pair released an automatic dialer, called the "Demon Dialer", in 1980. Developed for customers of independent phone companies wanting to make long-distance calls, which required dialing call prefix and feature group digits, the product helped Zoom grow to $6 million in annual sales.