This Motorola portable two-way radio has both GMRS and FRS channels fitted.

The GMRS two way radio service is a Land-Mobile FM UHF radio service designed for short-distance two-way communication in the United States, and which requires an $85 license from the FCC. The initials GMRS stands for General Mobile Radio Service.

GMRS radio licenses are issued to an individual adult, who may then use their GMRS two way radio to communicate with other licensed GMRS radio users — or to immediate family members.

Everyone covered by a license may use GMRS 2-way radios to communicate for personal or business purposes. Family members do not have to have a license as long as one adult in that family is licensed for GMRS two way radio. However employees of a GMRS license holder are not covered by their bosses license.

Most GMRS two way radios are portable handheld radios, just like the FRS walkie talkies. But the  GMRS walkie talkies are slightly better made, a little more powerful and consequently they are more expensive as well.

Both the FRS and GMRS radio services share some common frequencies. General Mobile Radio Service 2-way radios can be handheld walkie talkie radios or much more powerful base-station or business land-mobile radios – as long as those sets have been type approved for GMRS use by the FCC.

There are eight channels for GMRS exclusively, while seven GMRS channels are shared with Family Radio Service.

Those eight GMRS-only channels can be used in simplex or duplex mode. Simplex mode uses the same frequency to transmit and receive, while duplex uses two different frequencies and routes its transmissions through a relaying radio station called a repeater.

A radio repeater greatly extends the distance at which 2-way radio exchanges can be effectively carried out. Repeaters are commonplace in VHF and UHF radio networks used by police, government and emergency services, large business users and licensed amateur radio operators (hams). So GMRS radios are much more serious radios than FRS two way radios, but they can be used to communicate with FRS radios when required, using a lower power setting.

GMRS two way radio transceivers may also be connected to larger, more efficient, mobile or base-station UHF antennas to increase their effective range. (External antennas are not allowed to be attached to FRS radios, so their effective distance is minimal.)

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