The FCC will try to assist wireless microphone customers with any questions about making the transition to other microphones, Nodine said. Customers may also want to contact their microphone makers, he added. "We're going to do everything we can to help out customers," he said.

The FCC has already begun reaching out to people using wireless microphones, and the FCC will conduct an "aggressive" education campaign to reach out to wireless microphone users, the agency said in a press release.

The 700MHz band was formerly used by U.S. television stations, but the U.S. Congress voted in late 2005 to require stations to move off the spectrum and switch to all-digital broadcasts. U.S. TV stations exited the 700MHz spectrum last June.

The goal of the digital TV transition was to free up spectrum for commercial and public safety uses, but the portion of the spectrum dedicated for police and fire departments failed to sell in an early 2008 auction that raised $19.6 billion for the U.S. treasury. Several lawmakers pushed for the digital TV transition after the Sept. 11, 2001, terrorist attacks on the U.S. Many of the rescue agencies that responded to those attacks couldn't communicate with each other because they were using incompatible communications devices on different areas of the spectrum.

The Public Interest Spectrum Coalition, made up of six consumer and digital rights groups, petitioned the FCC to ban the use of wireless microphones on the 700MHz band.