I lock my door with the Key and some times the alarm goes off

What is your question?

Well when I purchase the car it was a fixer upper it was a lí´t of things wrong with it do I'm pretty much stuck with it to me it may be major but to others it maybe minor it was probley 10 things wrong like brakes ,hoses stuff like that so if I weren't working on it myself I would be out of lot of money so I'm saving money by working on it myself with help from the pros like you all . Some time I set the alarm on the car sometimes it goes off but no sound just lights just blinking on an off my neighbor call and told me it was going of and I went to bank and it did the same thing so hope u guys can help oh I forgot does the becon for the alarm were is it located minds is on the rearveiw mirror maybe that can help thanks again