FRS and GMRS personal radios operate in a small range of the ultra-high frequency (UHF) band to coordinate indoor and outdoor group or family activities. They enable communication for vehicle caravans, camping, sporting events, field trips, and similar pursuits that don't require the wider frequency range, more advanced features, and heavier duty construction of UHF business radios. These two-way radios transmit and receive messages over radio frequencies that work where cellular coverage may be spotty, overloaded, or unavailable. They operate on either Family Radio Service (FRS) or General Mobile Radio Service (GMRS), which are compatible services that share a group of channels. FRS and GMRS radios can talk to each other when set to the same channel. FRS is a license-free service with more limited range and fewer channels than GMRS, which requires a Federal Communications Commission (FCC) license to use.