Profile: Global Aerotech, Inc. offers active burglar prevention system. Our MARK III is a stand alone system designed exclusively for backing up alarm systems that is bypassed by thieves. Our SG-30 is a portable steel case system for protecting job sites and storage trailers. Our SG-50 unit is a stereo speaker look-alike case that housing the complete electronics package, as well as CN/Red canister. Our stealth guard control center is a LED system keypad that has 60 different functions, chime announcement, 30 different user codes, backlit touch pad, phone line monitor and automatic arming.