Cool looking retro microphone. It is a power mic for desk CB radio. It is amplified. It requires an 9 volt battery which is not included. There's a switch on the back that shuts off the microphone. (Don't know why) Perhaps it was for a noise toy at one point. The microphone is in good shape. The aluminum top has a little bit of corrosion on it but is nice and loud. It's got its nicks and scratches. Please check out pictures carefully. It is 4-pin. If you have any questions, you're more than welcome to email me. Thank you!