No good car thief gives a crap about car alarms eitherway an most younger thiefs that arent as well versed in the art of being a thief just walk the streets pulling door knobs to see if the car is open, an if it isnt open an the thing didnt go off when they tried to open it they are gonna know it doesnt have an alarm eitherway an lots of cars have little lights an dont have alarms so a light wont help you an some times an alarm wont even help you but i will tell you what will help you, a Big Rifle mounted in the back window an a bumper sticker that says the rifle in the back window isnt my only gun
^^^X2 LOL hey I did my own alarm, consits of 4 loud A$S factory car horns, and 2 LOUD sirens... hehehe u can hear it like a mile away.... sirens & horn & flashing lights at same time!!! imagine.... hehehe
but Im getting ready to redo it all again with a 2way fm alarm with 3mile radius! with vibration/chime alert on key chain.
NYPD 9v is wayy too much power for a LED... they use MILI volts... 10^-3 ... OK just do a search on google, they prop have thousands..