There are several things to consider when deciding whether to use an external security system. When purchasing an outdoor security camera, you want to look for a camera that is durable enough to withstand outdoor conditions but of sufficient quality to provide a clear picture.
Like any electronic component, some outdoor surveillance cameras are better than others. Also, check outdoor camera reviews and compare features before making the final purchase decision. The size and type of camera are important.
If you are interested in a wireless security camera, choose one with a transmission range that suits your home. Remember that the walls of your home, both inside and outside, reduce wireless coverage. With this setting, you may have to experiment with several locations until you find the location with the best "reception".
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At some point, you have to decide whether your camera will stay active all the time or only record when motion is detected. Whatever your preference, you'll want to choose a motion detector camera. That way, you have a choice.
Lastly, and often most importantly, you need to determine if your camera should be monitored by a professional security company. This is not mandatory but should be considered. Some people like the added level of security that comes with professional oversight.
When you choose a security camera company, make sure you know what you are getting. Like cameras, not all companies offer the same benefits and levels of service.