The Uniden PRO401HH 40-Channel Handheld CB Radio is a powerful and reliable mobile radio for the Citizens Band (CB) Radio Service. Boasting a superheterodyne circuit with Phase Locked Loop (PLL) technology, it offers precise frequency control across all 40 FCC-authorized AM frequencies. With an adjustable low- and high-power setting, you can save battery life or extend your range - so you always stay in touch.