Features:

• Remote microphone/speaker connection
• Earpiece connector on top
• Clip on back of mic
  

 An extra jack is included for connecting and optional earphone.  When the CA40 is connect to the CB, the microphone and speaker in the CB are disabled, and when an option earphone is connected to the CA40, the audio from the speaker on the CA40 is disabled.

The Cobra CA-40 speaker microphone is designed for us with the HH-40 radio.  It is also compatible with various other handheld radios including the Maxon HCB40wx, and Midland 75-785, 75-820, and 75-822 radios

Two pin -- Longer pin is approximately 9/16" and the shorter pin is approximately 7/16", and there is 1/4" between them.