I just purchased one from a dealer in Milford, C.T. I installed it today and it was a Bosch....I paid about 140 dollars and it should last till the replacement is 200 bucks....Is there anyone on/in the forum that replaces the batteries inside?....The newer sirens do not use the security bolt, they come with a threaded stud that needs a nut which is not included....not a bad job, worst part was cleaning and re assembly...