GMRS, the General Mobile Radio Service, or GMRS radios are intended for personal use in general communications.
It shares some channels with FRS, but it offers more power, range and versatility than lower power FRS radios.
GMRS radios are available in portable handheld models at up to 5 watt and mobile/base station models at up to 50 watts of power. With the frequency range 462`467MHZ.
So if you want to use the GMRS radios, you need to own the license, and lots of the GMRS radios can work with FRS Radios.