See The Other Mic Image Below

The RF Limited EC-2018 Turbo™ echo mic is the first echo mic with digital echo. It is also the first with both echo delay and echo volume controls on the outside of the mic. In addition, RF limited was the first to incorporate talkback in their echo mics. RF Limited has always been innovative with their products. They have spent time and money in developing products that the end user is looking for and this is also the reason they have the most copied products in the CB and Amateur radio market. Somehow though, the copies aren't as good. The copycats clone the packaging, but where it can't be seen, they cheapen it. If a RF Limited mic was side by side with one of its copies, you would immediately find the tone quality of the copy to be muddy sounding while the RF Limited mic would be clear and crisp sounding. Muffled modulation won't cut through all the garbage out there on the air, you get what you pay for.

"The Next Generation of Echo Microphones". Two new sounds were generated from this mic. First is the:

• Alien Voice™ sound effect. This is a metallic sound to the modulation when the echo delay is set to minimum and the echo volume is set to maximum. This is much more understandable than the Galaxy Robot Voice.
•  Second is the Whammy™ sound effect. This is generated by setting the echo volume to maximum and the echo delay about mid way and changing the delay as the echo is repeated.

The audio quality of this echo mic is still the best of all the echo mics on the market. With or without effects the audio is great. And for a power mic, the background noise isn't too bad. The echo delay at maximum will repeat about three words six or seven times before completely fading out. With the delay stretched out that long, the reproduction becomes distorted but still understandable.

The most common wiring available is the 4-pin Cobra/Galaxy/Uniden. It can be wired to any radio on the market today.
  
The EC-2018 Has A Very Flexible 3 Meter Coiled Cord 

EC-2018 Turbo™ Wire Color Code 

Black PTT Common
Shield Ground
Red Audio
White PTT TX
Blue PTT RX 

EC-2018 Turbo Specifications:
Sensitivity -25dB @ 1 KHz (at maximum output and minimum echo)
Impedance 1 K Ohm
Frequency Response 500 - 3 KHz
Echo Frequency Response 500 - 3 KHz
Echo Time 600ms Maximum
Battery 9 Volt Preferably Alkaline
Internal Noise 0.5mV or Less
Microphone Element ECM Type