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Question:

Why do car alarms have to blow the horn?

We have a house on a public street. So our neighbors in the apartment next to us refuse to use their off street parking, or even park in front of their own house! Instead, they park in front of my kids bedroom window and blow the horn 25 times at 2 am and 3 am. I just realized it is their car alarm being activated.What is the reason that car alarms have to blow the horn multiple times when they are activated?

Answer:

to generate the 1.21 gigawatts of electricity needed to send the delorean back to the future :) ok sure it was clock towerbut who knows when or where that thing could pop up.
PolycrapI mean polycarb was the worst possible choice for lenses that strong. Polycarb shouldn't be used in powers over - 3.00 max You need 1.67 aspheric high index lenses , or even 1.74 if you can afford them. Weight won't be a problem with lenses like that either. The choice of frame is also very important. In a power that high , every millimeter your eyes are decentered from the geometric centers of the frame, adds almost 1 mm in thickness to the edge. So the size of the frame is very important.
Are you asking, Can I give out free smoke detectors as an eagle project?? I'd say maybe. It depends on how you organize the project, and how willing the eagle coordinator in your council is to accept the project. Keep in mind that the Eagle badge is essentially a badge for leadership and management. You need to show that you are leading a group effort here, and organizing a decently complex project. Can you make this more than a Please give me smoke detectors, and Here's a free smoke detector kind of effort?
The same reason the Pope needs a bulletproof Pope-mobile.
If there isn't a God then why are you asking this question?

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