One of the best reasons to purchase a motion sensor alarm is because they offer a very cheap way of getting started on the home security ladder. From as little as $10 you can get a system That can detect movement and sound an alarm. The great thing about these all in one device is is that they are portable meaning they can be used by students in their dormitories as no installation is required. But they can also be mounted on or around garages sheds or your front or back door to alert you if someone approaches these entry points. Because a single unit is so cheap you can build a motion sensor alarm system to protect your entire home. Many of these devices can be harmed or disarm using a remote control so it is possible to mount them high up above doorways.

They can also be used as doorbells so instead of sending an ear piercing alarm they can sound a challenge to let you know someone is approaching. Also handy if you don't want anyone to sneak up on you while you are dosing in the garden on a sunny day.  Some alarm systems and allow you to have a separate sensor and alarm unit and a third type combines an alarm with a light, letting you choose if you want the alarm to be active or not. Often a light is enough to scare off an intruder, especially if you are illuminating the door they are likely to try and getting through.

A good combination of devices to bluff your way to better home security is a set of motion sensor alarms and some fake security cameras. The combination of an alarm along with a security camera makes it look as though the security camera has "seen" someone and sounded the alarm.

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