Since the later half of the 1990s though, your rodent has been ever significantly more likely to rely upon an optical sensor taking the form of a small CCD camera connected to motion sensing ...

The wireless DUAL TEC® motion sensor provides faster and more reliable detection using K-band microwaves ... it can provide a more reliable protection for rooms with large areas of glass such as ...

As an example, [Circuit Valley] has an IKEA Vallhorn motion sensor for a teardown ... ultrasonic welded case is a small PCB and a Fresnel lens on the inside of the top cover, and a small PCB ...