Handheld radio scanners are portable devices that allow users to tune into various radio frequencies and listen to communications in their vicinity. These scanners are commonly used by hobbyists, emergency personnel, and law enforcement agencies. They typically have a compact design and are equipped with an antenna for receiving signals. Handheld radio scanners can tune into a wide range of frequencies, including those used by police, fire departments, amateur radio operators, and even aircraft. Some models also have additional features such as the ability to store and scan multiple channels, display signal strength, and even decode digital radio signals. Overall, handheld radio scanners are valuable tools for staying informed and monitoring radio communications on the go.