The DM 452 is an amplified CB microphone designed to fit most CB and 10-meter radios. Great for Cobra 29's or other radios that don't already have echo CB microphone built-in. Slider on the front controls echo levels. Because of the extra functions it does require a 9V battery.
Cobra 25, 29, and newer 148 models
Uniden PC66, PC68, PC76, and PC78's
Galaxy DX919, DX929, DX939, DX949, DX959, DX979, DX2547, DX33, DX44, DX55, DX66, DX73, DX88, DX99, DX94, DX95, DX98
And many, many more radios.