Here is the "legendary" Delta Electronics designer of high tech communication equipment! See photo #4 for store front.
(Note: Proudly displayed their Delta M2 microphone in photo #1 in a truck stop radio shop quality display. Or that is their radio bench and they tune up radios with a Dosy meter and that same tech that designed the microphone. Most likely that is their bench since the radios they sell have an option for what they call a "wattage tuneup". Not an "alignment*, so they must crank all pots wide open for watts on that dosy, so you can blow the MOSFETs in your new radio in record time. They have Been in business since 1995 as a one stop shop. They are just a hole in the wall store selling Subs, CB's, GPS, Car Alarms, Cells Phones and Beepers who contracted with a Chinese manufacturer to make a microphone under their Delta name. No tech in that micorphone, Just an element, a cheap amplifier, a couple of pots to turn, a PTT switch and a meter that does not really mean anything or provide any useful information.. All for the low low price of $150.00.
Better link:
http://www.deltaelectronicsonline.com/default.asp?m=0