I think my parents think I’m sneaking Guys in.

Why tf is this a house alarm?? What’s the point of this..i didntsee because I wasn’t home but my dad put something that beeps near the garage door and when someone walks into the garage and when someone walks in the house it beeps. Wtf is this and why did he do this? We live in a really safe place. I think they think I’m sneaking guys in. I’m 17. If

My

Parents are not home and I’m home alone and let a guy in will they know??? I’ve sneaked guys in my room before I think my parents heard the window open and close or my brother told them because his room next to mine. But this wont stop me