The Radio Shack Realistic Extension CB Speaker 8 OHMS / 5 Watts 21-549A is an external speaker designed for use with CB, ham radio, or scanner equipment. With a power rating of 5 watts and an impedance of 8 ohms, this wired speaker delivers clear audio through its 3.5mm jack input. Made by Radio Shack and manufactured in Korea, this speaker is a reliable and high-quality option for enhancing your radio communication setup.