A scanner is a radio receiver that can automatically tune, or scan, two or more discrete frequencies, stopping when it finds a signal on one of them and then continuing to scan other frequencies when the initial transmission ceases.
An Icom IC-R5 hand-held scanner
A GMRS radio that also has scanning capabilities
A Uniden BCT-15 base trunktracking scanner
A Uniden scanner installed in a vehicle. Some US states prohibit this unless the operator has an FCC issued radio license
Citizens band radio is a land mobile radio system, a system allowing short-distance one-to-many bidirectional voice communication among individuals, using two-way radios operating near 27 MHz in the high frequency or shortwave band. Citizens band is distinct from other personal radio service allocations such as FRS, GMRS, MURS, UHF CB and the Amateur Radio Service. In many countries, CB operation does not require a license and may be used for business or personal communications.
Cobra 18 WX ST II mobile CB radio with microphone
Cobra 50 WX ST Handheld CB Radio
A QSL card issued by a US CB station in 1963
Image of Citizens Radio license 1972 issued by the United States Federal Communications Commission