the story started like this. After graduation i started my work in LA and lived alone. i thought of getting an alarm system and my parents asked me to do that too, but i was not that serious about it. One day, i received a call, telling me that someone was in my house. i was worried and rushed into home, finding out that my house got robbed. I knew if i will not sleep well and worried my home would be robbed again if i don't buy a security system.. so i went to looking into local stores and searched online, and finally got one. pretty easy to install. now i feel safe again. and i can have a good sleep at night. a security camera may cost you much, but don't have one will cost you more. from this experience, i also learned some security cameras self-installing knowledge. if anyone is interested, i would like to share.