These work on the basic principle of infrared, that is when a door or a window is opened and the infrared sensor is cut without prior intimation to the system, the security alarm goes off and alerts the concerned party of an abnormality in situation. This is very useful when people fear of break ins via windows and doors in the house. These security system can also be combined with other sensors like motion sensor and fire and smoke alarm sensor, finger print recognition, doorbell view camera etc. these security system can further be programmed to contact the police department and your personal guardian immediately in case of an emergency at home. The doorbell camera allows you to see who is at the front door before opening the door to welcoming them. This feature is also now available with newer version to capture the image from the camera in case of a suspicious person and later send the image to the concerned higher official. Fingerprint scanner on the front and garage doors of the home are breakthrough technology that allows homeowners to enter in key less. By inputting all the biometric information of the member in the house, every member can just open the door with the fingerprint access and hence quit the hassle of carrying keys or forgetting the keys or losing them. The back end information from these finger print detectors also lets the administrator know of who has been in and out of the house and at what time. Technological advancements are umpteen and using it wisely to our safety and convenience is the smart gadget buyer’s way. A Doorbell camera is an in built camera with a doorbell, which can be connected to a smartphone through the Internet.