I remember spending about $35 for mine, I will have to figure out the brand later, it's been 2 years since I've had it.
Mine works fine with all the camera and plastic stuff behind the mirror. I got best buy to run the wire and mount the mute button above my right knee. Cost $20 at the time, worth every penny, and they will un-install it at anytime free of charge. I use escort redline.