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1970's Texas Instruments DATAMAN Math Game Calculator Vintage tdfbcs939-Battery Operated

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Keep your home secure with our selected home safety resources:

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A Buyer’s Guide to Home Security Cameras
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1970's Texas Instruments DATAMAN Math Game Calculator Vintage tdfbcs939-Battery Operated

Item specifics

Condition:
Used: An item that has been previously used. See the seller’s listing for full details and description of ... Read moreabout the condition
Brand: Texas Instruments
Type: Handheld Electronic Game Sub-Type: Handheld
VINTAGE TRADE BOX OF ASSORTED FRICTION DRIVEN MODEL VANS home security_header

Home Security Systems: Selecting the best alarm company for your house

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Is your home at risk of being burglarized?​

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Types of home security systems

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This development is most apparent in the advancement of video surveillance. Video surveillance used to be old and bulky, offering blurry and unreliable images, but today’s surveillance cameras can be undetectably small and provide excellent high resolution streams that can viewed from anywhere in the world via smartphone.​

Types of sensors​

Motion sensors are widely used, in which the motion of something large enough will trigger an alarm and alert system. There are two types of motion sensors – passive and active, of which passive is far more common in home security situations.

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Passive motion sensors, commonly used within residential areas, can be purchased and utilized in two different ways:

Infrared motion detectors read heat given off by humans, animals, and even appliances. These systems, when a sudden rise of heat is detected (like that emitted from a human) will sound an alarm. Fortunately, this alarm ignores minor heat fluctuations, like the subtle rise of household temperature due to the sun setting and rising.

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Monitored or unmonitored?​

Security systems can be understood to fall under two principal categories: monitored, which send information and video footage to a central office, and unmonitored, which is connected to an alarm system installed within your home. Whether you opt for a monitored or unmonitored system mainly depends on how much you are willing and able to spend on home security.

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Wired or wireless?

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Wireless surveillance cameras come in many different shapes and sizes, and the recommended amount to have installed in one area is four. Each camera must be connected to both the receiver (phone, laptop, television) and some sort of power (generally batteries).

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Installation tips

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Costs and common features

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A basic, bare bones system will consist of a few door or window sensors, a motion sensor and a control panel and may only be monitored via a landline rather than through the internet or a cellular network. This type of monitoring is cheaper, yet there is always the risk that a thief will cut the phone line, rendering the system useless. One can expect to pay $10-$30 a month for a system of this nature, along with possible equipment and installation fees.

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Home security scams

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  • They may attempt to frighten you into having a system installed with bogus claims of heightened crime in the neighborhood or a rash of burglaries nearby.
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  • In general, it's always preferable to call and arrange an appointment with a home security company by yourself rather than to agree to a deal with a door-to-door sale agent.

How to avoid false alarms

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