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Here are a few basic models that are popular on Amazon:First Alert BRK 3120B $27. 18 This hardwired alarm uses both photoelectric and ionization sensors to detect smoke. It does not have a carbon monoxide sensor. First Alert SCO7CN $25. 97 This battery operated model has a photoelectric smoke sensor as well as a carbon monoxide detector. In addition to its siren, the unit can voice warnings and instructions.

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CCTV later became common in banks and stores to discourage theft, by recording evidence of criminal activity. In 1998, 3,000 CCTV systems were in use in New York City. The studies included in the meta analysis used quasi experimental evaluation designs that involve before and after measures of crime in experimental and control areas. However, several researchers have pointed to methodological problems associated with this research literature. First, researchers have argued that the British car park studies included in the meta analysis cannot accurately control for the fact that CCTV was introduced simultaneously with a range of other security related measures. Second, some have noted that, in many of the studies, there may be issues with selection bias since the introduction of CCTV was potentially endogenous to previous crime trends. In particular, the estimated effects may be biased if CCTV is introduced in response to crime trends. It has been argued that problems of selection bias and endogeneity can be addressed by stronger research designs such as randomized controlled trials and natural experiments. A 2017 review published in Journal of Scandinavian Studies in Criminology and Crime Prevention compiles seven studies that use such research designs. The studies included in the review found that CCTV reduced crime by 24 28% in public streets and urban subway stations. It also found that CCTV could decrease unruly behaviour in football stadiums and theft in supermarkets/mass merchant stores.

 

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But still the Viper home security system shows better features especially because you have control over security events in your home from a distance. This will definitely make you feel safe and secure even when you are not in your home. The Q See QT5680 8E4 1 8 Channel Full D1 Security Surveillance System with 8 High Resolution 700 TVL Cameras and 1 TB Hard Drive Gray/Black will keep your residence censored day and night to keep an eye on your belongings inside and/or outside. This security camera includes 8 High resolution weatherproof cameras with 700 TV lines of resolution allowing you to observe everything that is happening in your home with a clear resolution picture. Each camera provides up to 100 feet of night vision and comes with a pre installed 1 TB hard drive. The Q See QT5680 8E4 1 8 Channel Full D1 Security Surveillance System has remote internet monitoring allowing up to 10 users at the same time to see what is occurring in the home.