Wireless Outdoor Motion Sensor Wireless Home Motion Sensor Or Outdoor Security Camera Recommendations?

Wireless home motion sensor or outdoor security camera recommendations? - wireless outdoor motion sensor

I have a problem with people and friends, talk, or see me when they turn to leave me on my cell contact, the advantage that the door to my return to my room, want to reach my door, that my side yard and hit my window and the door closed. And it is a nuisance lately. More and more often do so at any time, day and night. And sometimes they're not just want to make or do something because I'm usually very tired when they want.

I am a relatively new student who needs to make as any other student, your work on time and must focus on the fact that work was still before playing. And I think it can not do this with friends who do not understand it clearly that I have to do.

So I was wondering whether it is a product I can call in my room and someone walks in the side door that I know I'm in my room? I have some products that seem to look very tempting at Home Depot, which is a base wordLithium-ion sensor that you on the wall or whatever situation you need anything, and another piece of the plug into an outlet on the common house "sounds" or alert me that someone is a come from behind.
This seems very simple and perhaps a solution to my problem.

But if a foreign monitor / camera system of security that someone knows what's best wireless and can provide a picture of my TV at home, please let me know where I can one.

Please and thank you all for your helpful answers!

Best answer gets 10 points!