A dual technology motion detector is a device that has some special features to detect motion by multiple methods. Usually, this includes both passive infrared technology and microwave radar. This activates only when both the sensors are triggered. These devices are perfect for the detection of the presence of an intruder. They are also good at reducing false alarms caused by objects like inanimate things or pets. People with other types of motion detectors are often disturbed by other false alarms. If you are looking for an accurate solution, then you should invest in these. However, this way, you may end up compromising the security.