1. Metro Alarm Systems 46777 7 Mile Rd, Northville, MI 48167 Coordinate: 42.42331,-83.50464 Phone: (734) 589-0666
2. Gentex Corp 21500 Haggerty Rd Ste 120, Northville, MI 48167 Coordinate: 42.4474,-83.43287 Phone: (248) 912-1927