The Astatic AST878DM is an Omni Directional Ceramic Desk microphone offering a rugged cycolac housing for industrial and commercial applications. The Microphone switching is accomplished with a simple PTT button with locking capabilities.

The volume of the CB desk mic can be adjusted with a potentiometer located under the base. The AST878DM is manufacturered to take normal abuse while retaining it's performance, just like you would expect from the Astatic brand.
 
Standard PTT "Push-to-talk" and "Lock-To-Talk" buttons
High quality omnidirectional ceramic cartridge
Five conductor shielded, strandard astatic color coded cable with 4-pin (standard Cobra/Galaxy wiring) connector
Requires 9 volt battery (not included)